Add missing fields to locales (part 5)

* Also includes minor fixes when I could (french, italian, icelandic)
* Added a new line at the end of en-US translation.

Updated ar.json     (Arabic)
Updated el.json     (Greek)
Updated fa.json     (Persian)
Updated fr.json     (French)
Updated is.json     (Icelandic)
Updated it.json     (Italian)
Updated tr.json     (Turkish)
Updated zh-TW.json  (Chinese, Taiwan)

locales/fa.json

@@ -357,7 +357,7 @@
     },
     "`x` seconds": {
         "([^.,0-9]|^)1([^.,0-9]|$)": "`x` ثانیه",
-        "`x` seconds.": "`x` ثانیه"
+        "": "`x` ثانیه"
     },
     "Fallback comments: ": "نظرات عقب گرد: ",
     "Popular": "محبوب",