Move language reading direction definition ("dir") from main language file to core

[Wiktor Walc]

It happens quite often that translators confuse the "dir" entry in main language file and try to translate it into something (e.g. between 4.1 and 4.1.1 releases two language files would get broken because of that).

Since we already store information about available language files in core/lang.js (CKEDITOR.lang), I'd like to propose moving this meta information about a language also to core.

Language files should contain only things that are supposed to be translated. Any other information should be moved outside of it.

[Anna Tomanek]

I can confirm that this used to happen quite often outside Transifex and still happens in Transifex even though we do have a comment to that string stating what the allowed values are.

[Piotr Jasiun]

Done.

​git:ce66819

[Olek Nowodziński]

• There's an unrelated commit in the branch (1765d6abb32c).
• We could save some bytes by changing:

  languages: { 'af':1,'ar':1,'bg':1,'foo-bar':1 ... }
  

  to

  languages: { af:1,ar:1,bg:1,'foo-bar':1 ... }
  

• CKEDITOR.lang.languages[ languageCode ]; in scriptLoader.load( ... ) is this.languages[ languageCode ]; (context passed to the loader, isn't it?).
• We need CKEDITOR.lang.rtl for package builder (Wiktor will explain ;)

[Piotr Jasiun]

I've separated list of supported languages and list of right-to-left languages. To save some bytes default is LTR and I keep only list of RTLs. I also fixed rest of issues.

• branch: ​t/10368

[Olek Nowodziński]

Pushed a very minor fix to the branch.

[Piotr Jasiun]

​git:a7609c3