beginning of 2.2 (one more fix)

- added download popup to solve the issue with downloads on ios
- merged big and small popups into one
- made buttons in donation menu act like buttons
- began to clean up localisation
- added ability to embed repo url into localisation strings
- moved ffmpeg args to config for more flexibility (and hopefully future changes)
- removed error response in stream that could result in a crash
- removed notice for ios users from about cause it's no longer relevant
- made error popup look and act like the rest
- a tiny bit of clean up
- changelog is now made out of latest commit (and doesn't break)

strings/en/desc.json

@@ -14,5 +14,6 @@
     "normalDownload": "download button opens a new tab with requested video. you can disable this popup in settings.",
     "download": "download",
     "copy": "copy url",
-    "open": "open"
+    "open": "open",
+    "github": ">> see previous changes and contribute on github"
 }