Add standard Settings menu item with Cmd+, on macOS

Yattee/Core/FileCommands.swift

@@ -17,6 +17,14 @@ struct FileCommands: Commands {
             }
             .keyboardShortcut("o", modifiers: [.command])
         }
+        #if os(macOS)
+        CommandGroup(replacing: .appSettings) {
+            Button(String(localized: "menu.app.settings")) {
+                NotificationCenter.default.post(name: .showSettings, object: nil)
+            }
+            .keyboardShortcut(",", modifiers: [.command])
+        }
+        #endif
     }
 }
 #endif

Yattee/Localizable.xcstrings

@@ -5142,6 +5142,16 @@
         }
       }
     },
+    "menu.app.settings" : {
+      "localizations" : {
+        "en" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "Settings..."
+          }
+        }
+      }
+    },
     "menu.file.openLink" : {
       "localizations" : {
         "en" : {