Add support for translations

src/invidious.cr

@@ -88,6 +88,15 @@ REDDIT_URL      = URI.parse("https://www.reddit.com")
 LOGIN_URL       = URI.parse("https://accounts.google.com")
 TEXTCAPTCHA_URL = URI.parse("http://textcaptcha.com/omarroth@hotmail.com.json")
 
+LOCALES = {
+  "ar"    => load_locale("ar"),
+  "de"    => load_locale("de"),
+  "en-US" => load_locale("en-US"),
+  "nl"    => load_locale("nl"),
+  "pl"    => load_locale("pl"),
+  "ru"    => load_locale("ru"),
+}
+
 crawl_threads.times do
   spawn do
     crawl_videos(PG_DB)
@@ -147,6 +156,7 @@ before_all do |env|
         env.set "challenge", challenge
         env.set "token", token
 
+        locale = user.preferences.locale
         env.set "user", user
         env.set "sid", sid
       end
@@ -158,6 +168,7 @@ before_all do |env|
         env.set "challenge", challenge
         env.set "token", token
 
+        locale = user.preferences.locale
         env.set "user", user
         env.set "sid", sid
       rescue ex
@@ -165,6 +176,10 @@ before_all do |env|
     end
   end
 
+  locale = env.params.query["hl"]? || locale
+  locale ||= "en-US"
+  env.set "locale", locale
+
   current_page = env.request.path
   if env.request.query
     query = HTTP::Params.parse(env.request.query.not_nil!)
@@ -180,7 +195,9 @@ before_all do |env|
 end
 
 get "/" do |env|
+  locale = LOCALES[env.get("locale").as(String)]?
   user = env.get? "user"
+
   if user
     user = user.as(User)
     if user.preferences.redirect_feed
@@ -192,12 +209,14 @@ get "/" do |env|
 end
 
 get "/licenses" do |env|
+  locale = LOCALES[env.get("locale").as(String)]?
   rendered "licenses"
 end
 
 # Videos
 
 get "/:id" do |env|
+  locale = LOCALES[env.get("locale").as(String)]?
   id = env.params.url["id"]
 
   if md = id.match(/[a-zA-Z0-9_-]{11}/)
@@ -219,6 +238,8 @@ get "/:id" do |env|
 end
 
 get "/watch" do |env|
+  locale = LOCALES[env.get("locale").as(String)]?
+
   if env.params.query.to_s.includes?("%20") || env.params.query.to_s.includes?("+")
     url = "/watch?" + env.params.query.to_s.gsub("%20", "").delete("+")
     next env.redirect url
@@ -287,11 +308,11 @@ get "/watch" do |env|
 
       if source == "youtube"
         begin
-          comment_html = JSON.parse(fetch_youtube_comments(id, "", proxies, "html"))["contentHtml"]
+          comment_html = JSON.parse(fetch_youtube_comments(id, "", proxies, "html", locale))["contentHtml"]
         rescue ex
           if preferences.comments[1] == "reddit"
             comments, reddit_thread = fetch_reddit_comments(id)
-            comment_html = template_reddit_comments(comments)
+            comment_html = template_reddit_comments(comments, locale)
 
             comment_html = fill_links(comment_html, "https", "www.reddit.com")
             comment_html = replace_links(comment_html)
@@ -300,18 +321,18 @@ get "/watch" do |env|
       elsif source == "reddit"
         begin
           comments, reddit_thread = fetch_reddit_comments(id)
-          comment_html = template_reddit_comments(comments)
+          comment_html = template_reddit_comments(comments, locale)
 
           comment_html = fill_links(comment_html, "https", "www.reddit.com")
           comment_html = replace_links(comment_html)
         rescue ex
           if preferences.comments[1] == "youtube"
-            comment_html = JSON.parse(fetch_youtube_comments(id, "", proxies, "html"))["contentHtml"]
+            comment_html = JSON.parse(fetch_youtube_comments(id, "", proxies, "html", locale))["contentHtml"]
           end
         end
       end
     else
-      comment_html = JSON.parse(fetch_youtube_comments(id, "", proxies, "html"))["contentHtml"]
+      comment_html = JSON.parse(fetch_youtube_comments(id, "", proxies, "html", locale))["contentHtml"]
     end
 
     comment_html ||= ""
@@ -383,6 +404,7 @@ get "/watch" do |env|
 end
 
 get "/embed/:id" do |env|
+  locale = LOCALES[env.get("locale").as(String)]?
   id = env.params.url["id"]
 
   if id.includes?("%20") || id.includes?("+") || env.params.query.to_s.includes?("%20") || env.params.query.to_s.includes?("+")
@@ -470,6 +492,8 @@ end
 # Playlists
 
 get "/playlist" do |env|
+  locale = LOCALES[env.get("locale").as(String)]?
+
   plid = env.params.query["list"]?
   if !plid
     next env.redirect "/"
@@ -483,14 +507,14 @@ get "/playlist" do |env|
   end
 
   begin
-    playlist = fetch_playlist(plid)
+    playlist = fetch_playlist(plid, locale)
   rescue ex
     error_message = ex.message
     next templated "error"
   end
 
   begin
-    videos = fetch_playlist_videos(plid, page, playlist.video_count)
+    videos = fetch_playlist_videos(plid, page, playlist.video_count, locale)
   rescue ex
     videos = [] of PlaylistVideo
   end
@@ -499,6 +523,8 @@ get "/playlist" do |env|
 end
 
 get "/mix" do |env|
+  locale = LOCALES[env.get("locale").as(String)]?
+
   rdid = env.params.query["list"]?
   if !rdid
     next env.redirect "/"
@@ -508,7 +534,7 @@ get "/mix" do |env|
   continuation ||= rdid.lchop("RD")
 
   begin
-    mix = fetch_mix(rdid, continuation)
+    mix = fetch_mix(rdid, continuation, locale: locale)
   rescue ex
     error_message = ex.message
     next templated "error"
@@ -520,6 +546,7 @@ end
 # Search
 
 get "/opensearch.xml" do |env|
+  locale = LOCALES[env.get("locale").as(String)]?
   env.response.content_type = "application/opensearchdescription+xml"
 
   XML.build(indent: "  ", encoding: "UTF-8") do |xml|
@@ -535,6 +562,8 @@ get "/opensearch.xml" do |env|
 end
 
 get "/results" do |env|
+  locale = LOCALES[env.get("locale").as(String)]?
+
   query = env.params.query["search_query"]?
   query ||= env.params.query["q"]?
   query ||= ""
@@ -550,6 +579,8 @@ get "/results" do |env|
 end
 
 get "/search" do |env|
+  locale = LOCALES[env.get("locale").as(String)]?
+
   query = env.params.query["search_query"]?
   query ||= env.params.query["q"]?
   query ||= ""
@@ -629,6 +660,8 @@ end
 # Users
 
 get "/login" do |env|
+  locale = LOCALES[env.get("locale").as(String)]?
+
   user = env.get? "user"
   if user
     next env.redirect "/feed/subscriptions"
@@ -668,6 +701,8 @@ end
 
 # See https://github.com/rg3/youtube-dl/blob/master/youtube_dl/extractor/youtube.py#L79
 post "/login" do |env|
+  locale = LOCALES[env.get("locale").as(String)]?
+
   referer = get_referer(env, "/feed/subscriptions")
 
   email = env.params.body["email"]?
@@ -754,7 +789,7 @@ post "/login" do |env|
       headers["Cookie"] = URI.unescape(headers["Cookie"])
 
       if challenge_results[0][-1]?.try &.[5] == "INCORRECT_ANSWER_ENTERED"
-        error_message = "Incorrect password"
+        error_message = translate(locale, "Incorrect password")
         next templated "error"
       end
 
@@ -775,7 +810,7 @@ post "/login" do |env|
 
         if tfa[2] == "TWO_STEP_VERIFICATION"
           if tfa[5] == "QUOTA_EXCEEDED"
-            error_message = "Quota exceeded, try again in a few hours"
+            error_message = translate(locale, "Quota exceeded, try again in a few hours")
             next templated "error"
           end
 
@@ -806,7 +841,7 @@ post "/login" do |env|
           challenge_results = JSON.parse(challenge_results)
 
           if challenge_results[0][-1]?.try &.[5] == "INCORRECT_ANSWER_ENTERED"
-            error_message = "Invalid TFA code"
+            error_message = translate(locale, "Invalid TFA code")
             next templated "error"
           end
         end
@@ -845,7 +880,7 @@ post "/login" do |env|
 
       env.redirect referer
     rescue ex
-      error_message = "Login failed. This may be because two-factor authentication is not enabled on your account."
+      error_message = translate(locale, "Login failed. This may be because two-factor authentication is not enabled on your account.")
       next templated "error"
     end
   elsif account_type == "invidious"
@@ -860,10 +895,10 @@ post "/login" do |env|
       token = env.params.body["token"]?
 
       begin
-        validate_response(challenge, token, answer, "sign_in", HMAC_KEY, PG_DB)
+        validate_response(challenge, token, answer, "sign_in", HMAC_KEY, PG_DB, locale)
       rescue ex
-        if ex.message == "Invalid user"
-          error_message = "Invalid answer"
+        if ex.message == translate(locale, "Invalid user")
+          error_message = translate(locale, "Invalid answer")
         else
           error_message = ex.message
         end
@@ -878,16 +913,16 @@ post "/login" do |env|
 
       found_valid_captcha = false
 
-      error_message = "Invalid CAPTCHA"
+      error_message = translate(locale, "Invalid CAPTCHA")
       challenges.each_with_index do |challenge, i|
         begin
           challenge = challenge[1]
           token = tokens[i][1]
-          validate_response(challenge, token, text_answer, "sign_in", HMAC_KEY, PG_DB)
+          validate_response(challenge, token, text_answer, "sign_in", HMAC_KEY, PG_DB, locale)
           found_valid_captcha = true
         rescue ex
-          if ex.message == "Invalid user"
-            error_message = "Invalid answer"
+          if ex.message == translate(locale, "Invalid user")
+            error_message = translate(locale, "Invalid answer")
           else
             error_message = ex.message
           end
@@ -898,7 +933,7 @@ post "/login" do |env|
         next templated "error"
       end
     else
-      error_message = "CAPTCHA is a required field"
+      error_message = translate(locale, "CAPTCHA is a required field")
       next templated "error"
     end
 
@@ -906,12 +941,12 @@ post "/login" do |env|
     action ||= "signin"
 
     if !email
-      error_message = "User ID is a required field"
+      error_message = translate(locale, "User ID is a required field")
       next templated "error"
     end
 
     if !password
-      error_message = "Password is a required field"
+      error_message = translate(locale, "Password is a required field")
       next templated "error"
     end
 
@@ -919,12 +954,12 @@ post "/login" do |env|
       user = PG_DB.query_one?("SELECT * FROM users WHERE LOWER(email) = LOWER($1) AND password IS NOT NULL", email, as: User)
 
       if !user
-        error_message = "Invalid username or password"
+        error_message = translate(locale, "Invalid username or password")
         next templated "error"
       end
 
       if !user.password
-        error_message = "Please sign in using 'Sign in with Google'"
+        error_message = translate(locale, "Please sign in using 'Sign in with Google'")
         next templated "error"
       end
 
@@ -946,24 +981,24 @@ post "/login" do |env|
             secure: secure, http_only: true)
         end
       else
-        error_message = "Invalid username or password"
+        error_message = translate(locale, "Invalid username or password")
         next templated "error"
       end
     elsif action == "register"
       if password.empty?
-        error_message = "Password cannot be empty"
+        error_message = translate(locale, "Password cannot be empty")
         next templated "error"
       end
 
       # See https://security.stackexchange.com/a/39851
       if password.size > 55
-        error_message = "Password cannot be longer than 55 characters"
+        error_message = translate(locale, "Password cannot be longer than 55 characters")
         next templated "error"
       end
 
       user = PG_DB.query_one?("SELECT * FROM users WHERE LOWER(email) = LOWER($1) AND password IS NOT NULL", email, as: User)
       if user
-        error_message = "Please sign in"
+        error_message = translate(locale, "Please sign in")
         next templated "error"
       end
 
@@ -1002,6 +1037,8 @@ post "/login" do |env|
 end
 
 get "/signout" do |env|
+  locale = LOCALES[env.get("locale").as(String)]?
+
   user = env.get? "user"
   referer = get_referer(env)
 
@@ -1012,7 +1049,7 @@ get "/signout" do |env|
     token = env.params.query["token"]?
 
     begin
-      validate_response(challenge, token, user.email, "sign_out", HMAC_KEY, PG_DB)
+      validate_response(challenge, token, user.email, "sign_out", HMAC_KEY, PG_DB, locale)
     rescue ex
       error_message = ex.message
       next templated "error"
@@ -1033,6 +1070,8 @@ get "/signout" do |env|
 end
 
 get "/preferences" do |env|
+  locale = LOCALES[env.get("locale").as(String)]?
+
   user = env.get? "user"
   referer = get_referer(env)
 
@@ -1045,6 +1084,8 @@ get "/preferences" do |env|
 end
 
 post "/preferences" do |env|
+  locale = LOCALES[env.get("locale").as(String)]?
+
   user = env.get? "user"
   referer = get_referer(env)
 
@@ -1093,6 +1134,9 @@ post "/preferences" do |env|
     redirect_feed ||= "off"
     redirect_feed = redirect_feed == "on"
 
+    locale = env.params.body["locale"]?.try &.as(String)
+    locale ||= "en-US"
+
     dark_mode = env.params.body["dark_mode"]?.try &.as(String)
     dark_mode ||= "off"
     dark_mode = dark_mode == "on"
@@ -1131,6 +1175,7 @@ post "/preferences" do |env|
       "captions"           => captions,
       "related_videos"     => related_videos,
       "redirect_feed"      => redirect_feed,
+      "locale"             => locale,
       "dark_mode"          => dark_mode,
       "thin_mode"          => thin_mode,
       "max_results"        => max_results,
@@ -1147,6 +1192,8 @@ post "/preferences" do |env|
 end
 
 get "/toggle_theme" do |env|
+  locale = LOCALES[env.get("locale").as(String)]?
+
   user = env.get? "user"
   referer = get_referer(env)
 
@@ -1167,6 +1214,8 @@ get "/toggle_theme" do |env|
 end
 
 get "/mark_watched" do |env|
+  locale = LOCALES[env.get("locale").as(String)]?
+
   user = env.get? "user"
   referer = get_referer(env, "/feed/subscriptions")
 
@@ -1195,6 +1244,8 @@ get "/mark_watched" do |env|
 end
 
 get "/mark_unwatched" do |env|
+  locale = LOCALES[env.get("locale").as(String)]?
+
   user = env.get? "user"
   referer = get_referer(env, "/feed/history")
 
@@ -1225,6 +1276,8 @@ end
 # /modify_notifications?receive_all_updates=false&receive_no_updates=false
 # will "unding" all subscriptions.
 get "/modify_notifications" do |env|
+  locale = LOCALES[env.get("locale").as(String)]?
+
   user = env.get? "user"
   referer = get_referer(env)
 
@@ -1270,6 +1323,8 @@ get "/modify_notifications" do |env|
 end
 
 get "/subscription_manager" do |env|
+  locale = LOCALES[env.get("locale").as(String)]?
+
   user = env.get? "user"
   referer = get_referer(env, "/")
 
@@ -1351,6 +1406,8 @@ get "/subscription_manager" do |env|
 end
 
 get "/data_control" do |env|
+  locale = LOCALES[env.get("locale").as(String)]?
+
   user = env.get? "user"
   referer = get_referer(env)
 
@@ -1364,6 +1421,8 @@ get "/data_control" do |env|
 end
 
 post "/data_control" do |env|
+  locale = LOCALES[env.get("locale").as(String)]?
+
   user = env.get? "user"
   referer = get_referer(env)
 
@@ -1495,6 +1554,8 @@ post "/data_control" do |env|
 end
 
 get "/subscription_ajax" do |env|
+  locale = LOCALES[env.get("locale").as(String)]?
+
   user = env.get? "user"
   referer = get_referer(env)
 
@@ -1574,6 +1635,8 @@ get "/subscription_ajax" do |env|
 end
 
 get "/delete_account" do |env|
+  locale = LOCALES[env.get("locale").as(String)]?
+
   user = env.get? "user"
   referer = get_referer(env)
 
@@ -1589,6 +1652,8 @@ get "/delete_account" do |env|
 end
 
 post "/delete_account" do |env|
+  locale = LOCALES[env.get("locale").as(String)]?
+
   user = env.get? "user"
   referer = get_referer(env)
 
@@ -1599,7 +1664,7 @@ post "/delete_account" do |env|
     token = env.params.body["token"]?
 
     begin
-      validate_response(challenge, token, user.email, "delete_account", HMAC_KEY, PG_DB)
+      validate_response(challenge, token, user.email, "delete_account", HMAC_KEY, PG_DB, locale)
     rescue ex
       error_message = ex.message
       next templated "error"
@@ -1619,6 +1684,8 @@ post "/delete_account" do |env|
 end
 
 get "/clear_watch_history" do |env|
+  locale = LOCALES[env.get("locale").as(String)]?
+
   user = env.get? "user"
   referer = get_referer(env)
 
@@ -1634,6 +1701,8 @@ get "/clear_watch_history" do |env|
 end
 
 post "/clear_watch_history" do |env|
+  locale = LOCALES[env.get("locale").as(String)]?
+
   user = env.get? "user"
   referer = get_referer(env)
 
@@ -1644,7 +1713,7 @@ post "/clear_watch_history" do |env|
     token = env.params.body["token"]?
 
     begin
-      validate_response(challenge, token, user.email, "clear_watch_history", HMAC_KEY, PG_DB)
+      validate_response(challenge, token, user.email, "clear_watch_history", HMAC_KEY, PG_DB, locale)
     rescue ex
       error_message = ex.message
       next templated "error"
@@ -1659,19 +1728,25 @@ end
 # Feeds
 
 get "/feed/top" do |env|
+  locale = LOCALES[env.get("locale").as(String)]?
+
   templated "top"
 end
 
 get "/feed/popular" do |env|
+  locale = LOCALES[env.get("locale").as(String)]?
+
   templated "popular"
 end
 
 get "/feed/trending" do |env|
+  locale = LOCALES[env.get("locale").as(String)]?
+
   trending_type = env.params.query["type"]?
   region = env.params.query["region"]?
 
   begin
-    trending = fetch_trending(trending_type, proxies, region)
+    trending = fetch_trending(trending_type, proxies, region, locale)
   rescue ex
     error_message = "#{ex.message}"
     next templated "error"
@@ -1681,6 +1756,8 @@ get "/feed/trending" do |env|
 end
 
 get "/feed/subscriptions" do |env|
+  locale = LOCALES[env.get("locale").as(String)]?
+
   user = env.get? "user"
   referer = get_referer(env)
 
@@ -1814,6 +1891,8 @@ get "/feed/subscriptions" do |env|
 end
 
 get "/feed/history" do |env|
+  locale = LOCALES[env.get("locale").as(String)]?
+
   user = env.get? "user"
   referer = get_referer(env)
 
@@ -1837,11 +1916,13 @@ get "/feed/history" do |env|
 end
 
 get "/feed/channel/:ucid" do |env|
+  locale = LOCALES[env.get("locale").as(String)]?
+
   env.response.content_type = "text/xml"
   ucid = env.params.url["ucid"]
 
   begin
-    author, ucid, auto_generated = get_about_info(ucid)
+    author, ucid, auto_generated = get_about_info(ucid, locale)
   rescue ex
     error_message = ex.message
     halt env, status_code: 500, response: error_message
@@ -1906,6 +1987,8 @@ get "/feed/channel/:ucid" do |env|
 end
 
 get "/feed/private" do |env|
+  locale = LOCALES[env.get("locale").as(String)]?
+
   token = env.params.query["token"]?
 
   if !token
@@ -1978,7 +2061,7 @@ get "/feed/private" do |env|
       "xml:lang": "en-US") do
       xml.element("link", "type": "text/html", rel: "alternate", href: "#{host_url}/feed/subscriptions")
       xml.element("link", "type": "application/atom+xml", rel: "self", href: "#{host_url}#{path}?#{query}")
-      xml.element("title") { xml.text "Invidious Private Feed for #{user.email}" }
+      xml.element("title") { xml.text translate(locale, "Invidious Private Feed for `x`", user.email) }
 
       videos.each do |video|
         xml.element("entry") do
@@ -2011,6 +2094,8 @@ get "/feed/private" do |env|
 end
 
 get "/feed/playlist/:plid" do |env|
+  locale = LOCALES[env.get("locale").as(String)]?
+
   plid = env.params.url["plid"]
 
   host_url = make_host_url(Kemal.config.ssl || CONFIG.https_only, env.request.headers["Host"]?)
@@ -2047,6 +2132,8 @@ end
 # YouTube appears to let users set a "brand" URL that
 # is different from their username, so we convert that here
 get "/c/:user" do |env|
+  locale = LOCALES[env.get("locale").as(String)]?
+
   client = make_client(YT_URL)
   user = env.params.url["user"]
 
@@ -2072,6 +2159,8 @@ get "/user/:user/videos" do |env|
 end
 
 get "/channel/:ucid" do |env|
+  locale = LOCALES[env.get("locale").as(String)]?
+
   user = env.get? "user"
   if user
     user = user.as(User)
@@ -2088,7 +2177,7 @@ get "/channel/:ucid" do |env|
   sort_by ||= "newest"
 
   begin
-    author, ucid, auto_generated, sub_count = get_about_info(ucid)
+    author, ucid, auto_generated, sub_count = get_about_info(ucid, locale)
   rescue ex
     error_message = ex.message
     next templated "error"
@@ -2108,6 +2197,8 @@ get "/channel/:ucid" do |env|
 end
 
 get "/channel/:ucid/videos" do |env|
+  locale = LOCALES[env.get("locale").as(String)]?
+
   ucid = env.params.url["ucid"]
   params = env.request.query
 
@@ -2123,6 +2214,8 @@ end
 # API Endpoints
 
 get "/api/v1/captions/:id" do |env|
+  locale = LOCALES[env.get("locale").as(String)]?
+
   env.response.content_type = "application/json"
 
   id = env.params.url["id"]
@@ -2222,6 +2315,8 @@ get "/api/v1/captions/:id" do |env|
 end
 
 get "/api/v1/comments/:id" do |env|
+  locale = LOCALES[env.get("locale").as(String)]?
+
   env.response.content_type = "application/json"
 
   id = env.params.url["id"]
@@ -2237,7 +2332,7 @@ get "/api/v1/comments/:id" do |env|
 
   if source == "youtube"
     begin
-      comments = fetch_youtube_comments(id, continuation, proxies, format)
+      comments = fetch_youtube_comments(id, continuation, proxies, format, locale)
     rescue ex
       error_message = {"error" => ex.message}.to_json
       halt env, status_code: 500, response: error_message
@@ -2247,7 +2342,7 @@ get "/api/v1/comments/:id" do |env|
   elsif source == "reddit"
     begin
       comments, reddit_thread = fetch_reddit_comments(id)
-      content_html = template_reddit_comments(comments)
+      content_html = template_reddit_comments(comments, locale)
 
       content_html = fill_links(content_html, "https", "www.reddit.com")
       content_html = replace_links(content_html)
@@ -2276,6 +2371,8 @@ get "/api/v1/comments/:id" do |env|
 end
 
 get "/api/v1/insights/:id" do |env|
+  locale = LOCALES[env.get("locale").as(String)]?
+
   id = env.params.url["id"]
   env.response.content_type = "application/json"
 
@@ -2356,6 +2453,8 @@ get "/api/v1/insights/:id" do |env|
 end
 
 get "/api/v1/videos/:id" do |env|
+  locale = LOCALES[env.get("locale").as(String)]?
+
   env.response.content_type = "application/json"
 
   id = env.params.url["id"]
@@ -2388,7 +2487,7 @@ get "/api/v1/videos/:id" do |env|
       json.field "description", description
       json.field "descriptionHtml", video.description
       json.field "published", video.published.to_unix
-      json.field "publishedText", "#{recode_date(video.published)} ago"
+      json.field "publishedText", translate(locale, "`x` ago", recode_date(video.published))
       json.field "keywords", video.keywords
 
       json.field "viewCount", video.views
@@ -2559,11 +2658,13 @@ get "/api/v1/videos/:id" do |env|
 end
 
 get "/api/v1/trending" do |env|
+  locale = LOCALES[env.get("locale").as(String)]?
+
   region = env.params.query["region"]?
   trending_type = env.params.query["type"]?
 
   begin
-    trending = fetch_trending(trending_type, proxies, region)
+    trending = fetch_trending(trending_type, proxies, region, locale)
   rescue ex
     error_message = {"error" => ex.message}.to_json
     halt env, status_code: 500, response: error_message
@@ -2587,7 +2688,7 @@ get "/api/v1/trending" do |env|
           json.field "authorUrl", "/channel/#{video.ucid}"
 
           json.field "published", video.published.to_unix
-          json.field "publishedText", "#{recode_date(video.published)} ago"
+          json.field "publishedText", translate(locale, "`x` ago", recode_date(video.published))
           json.field "description", video.description
           json.field "descriptionHtml", video.description_html
           json.field "liveNow", video.live_now
@@ -2603,6 +2704,8 @@ get "/api/v1/trending" do |env|
 end
 
 get "/api/v1/popular" do |env|
+  locale = LOCALES[env.get("locale").as(String)]?
+
   videos = JSON.build do |json|
     json.array do
       popular_videos.each do |video|
@@ -2619,7 +2722,7 @@ get "/api/v1/popular" do |env|
           json.field "authorId", video.ucid
           json.field "authorUrl", "/channel/#{video.ucid}"
           json.field "published", video.published.to_unix
-          json.field "publishedText", "#{recode_date(video.published)} ago"
+          json.field "publishedText", translate(locale, "`x` ago", recode_date(video.published))
         end
       end
     end
@@ -2630,6 +2733,8 @@ get "/api/v1/popular" do |env|
 end
 
 get "/api/v1/top" do |env|
+  locale = LOCALES[env.get("locale").as(String)]?
+
   videos = JSON.build do |json|
     json.array do
       top_videos.each do |video|
@@ -2647,7 +2752,7 @@ get "/api/v1/top" do |env|
           json.field "authorId", video.ucid
           json.field "authorUrl", "/channel/#{video.ucid}"
           json.field "published", video.published.to_unix
-          json.field "publishedText", "#{recode_date(video.published)} ago"
+          json.field "publishedText", translate(locale, "`x` ago", recode_date(video.published))
 
           description = video.description.gsub("<br>", "\n")
           description = description.gsub("<br/>", "\n")
@@ -2664,6 +2769,8 @@ get "/api/v1/top" do |env|
 end
 
 get "/api/v1/channels/:ucid" do |env|
+  locale = LOCALES[env.get("locale").as(String)]?
+
   env.response.content_type = "application/json"
 
   ucid = env.params.url["ucid"]
@@ -2671,7 +2778,7 @@ get "/api/v1/channels/:ucid" do |env|
   sort_by ||= "newest"
 
   begin
-    author, ucid, auto_generated = get_about_info(ucid)
+    author, ucid, auto_generated = get_about_info(ucid, locale)
   rescue ex
     error_message = {"error" => ex.message}.to_json
     halt env, status_code: 500, response: error_message
@@ -2817,7 +2924,7 @@ get "/api/v1/channels/:ucid" do |env|
 
               json.field "viewCount", video.views
               json.field "published", video.published.to_unix
-              json.field "publishedText", "#{recode_date(video.published)} ago"
+              json.field "publishedText", translate(locale, "`x` ago", recode_date(video.published))
               json.field "lengthSeconds", video.length_seconds
               json.field "liveNow", video.live_now
               json.field "paid", video.paid
@@ -2860,6 +2967,8 @@ end
 
 ["/api/v1/channels/:ucid/videos", "/api/v1/channels/videos/:ucid"].each do |route|
   get route do |env|
+    locale = LOCALES[env.get("locale").as(String)]?
+
     env.response.content_type = "application/json"
 
     ucid = env.params.url["ucid"]
@@ -2869,7 +2978,7 @@ end
     sort_by ||= "newest"
 
     begin
-      author, ucid, auto_generated = get_about_info(ucid)
+      author, ucid, auto_generated = get_about_info(ucid, locale)
     rescue ex
       error_message = {"error" => ex.message}.to_json
       halt env, status_code: 500, response: error_message
@@ -2908,7 +3017,7 @@ end
 
             json.field "viewCount", video.views
             json.field "published", video.published.to_unix
-            json.field "publishedText", "#{recode_date(video.published)} ago"
+            json.field "publishedText", translate(locale, "`x` ago", recode_date(video.published))
             json.field "lengthSeconds", video.length_seconds
             json.field "liveNow", video.live_now
             json.field "paid", video.paid
@@ -2923,6 +3032,8 @@ end
 end
 
 get "/api/v1/channels/search/:ucid" do |env|
+  locale = LOCALES[env.get("locale").as(String)]?
+
   env.response.content_type = "application/json"
 
   ucid = env.params.url["ucid"]
@@ -2957,7 +3068,7 @@ get "/api/v1/channels/search/:ucid" do |env|
 
             json.field "viewCount", item.views
             json.field "published", item.published.to_unix
-            json.field "publishedText", "#{recode_date(item.published)} ago"
+            json.field "publishedText", translate(locale, "`x` ago", recode_date(item.published))
             json.field "lengthSeconds", item.length_seconds
             json.field "liveNow", item.live_now
             json.field "paid", item.paid
@@ -3021,6 +3132,8 @@ get "/api/v1/channels/search/:ucid" do |env|
 end
 
 get "/api/v1/search" do |env|
+  locale = LOCALES[env.get("locale").as(String)]?
+
   env.response.content_type = "application/json"
 
   query = env.params.query["q"]?
@@ -3080,7 +3193,7 @@ get "/api/v1/search" do |env|
 
             json.field "viewCount", item.views
             json.field "published", item.published.to_unix
-            json.field "publishedText", "#{recode_date(item.published)} ago"
+            json.field "publishedText", translate(locale, "`x` ago", recode_date(item.published))
             json.field "lengthSeconds", item.length_seconds
             json.field "liveNow", item.live_now
             json.field "paid", item.paid
@@ -3144,6 +3257,8 @@ get "/api/v1/search" do |env|
 end
 
 get "/api/v1/playlists/:plid" do |env|
+  locale = LOCALES[env.get("locale").as(String)]?
+
   env.response.content_type = "application/json"
   plid = env.params.url["plid"]
 
@@ -3160,14 +3275,14 @@ get "/api/v1/playlists/:plid" do |env|
   end
 
   begin
-    playlist = fetch_playlist(plid)
+    playlist = fetch_playlist(plid, locale)
   rescue ex
     error_message = {"error" => "Playlist is empty"}.to_json
     halt env, status_code: 500, response: error_message
   end
 
   begin
-    videos = fetch_playlist_videos(plid, page, playlist.video_count, continuation)
+    videos = fetch_playlist_videos(plid, page, playlist.video_count, continuation, locale)
   rescue ex
     videos = [] of PlaylistVideo
   end
@@ -3241,6 +3356,8 @@ get "/api/v1/playlists/:plid" do |env|
 end
 
 get "/api/v1/mixes/:rdid" do |env|
+  locale = LOCALES[env.get("locale").as(String)]?
+
   env.response.content_type = "application/json"
 
   rdid = env.params.url["rdid"]
@@ -3252,7 +3369,7 @@ get "/api/v1/mixes/:rdid" do |env|
   format ||= "json"
 
   begin
-    mix = fetch_mix(rdid, continuation)
+    mix = fetch_mix(rdid, continuation, locale: locale)
 
     if !rdid.ends_with? continuation
       mix = fetch_mix(rdid, mix.videos[1].id)