Problem of languagePrefs (BCP 47 and ISO 639-1)

[KuwaLee]

Describe the bug

If change the app display language before login, the AppLanguage code will be added to languagePrefs.contentLanguages array, instead of add LANGUAGES

AppLanguage is manage by lingui, and it use BCP 47 which can contain region code (for example zh-TW) LANGUAGES is set of ISO 639 (in this case it will only have zh)

That will make (for this example) zh-TW stuck in contentLanguages and settings in UI will neither show nor be able to removing it.

And

      if (!preferredLangsCode2.length || preferredLangsCode2.length === 0) {
        return slices
      }

this code will take no effect in src\lib\api\feed-manip.ts, since there is always one string in array (for this example zh-TW)

The only possible way to remove (for this example) zh-TW is to reset all settings

Details

• Platform: Web are tested, other platform would also be affected