This spike has two parts
Introduce in-app language setting on account screen so that learner can update language within the app and make app language independent from device language setting.
Mobile language would sync with the website language preferences.
When user will set language from edx.org site preferences, app would sync with the site preference setting language.
When user will update language from mobile app setting, sites preferences would sync with the mobile app language setting. (This may require API which would take a language setting parameter from mobile app and update the edx.org site preferences)
This feature would have multiple benefits to learners, Firstly the language setting would be sync and same language would appear if the user would login either on iOS, Android. Secondly update language would be easy from within the app and it would be independent from device language setting.