A side thought: I don't know whether Android supports script variants for Serbian. I see only Cyrillic on my devices, but some other devices may support Latin.

If we cannot support variants for UI translation because of the Android limitation, then Cyrillic should be the one we export for the app, given that it's what we have as the default in Wikipedia and on the devices that I can see, but Serbian speakers may shed more light on the issue.

Can be resolved by adding a code map in the yaml configuration. Android only supports two letter codes.

(In reply to Siebrand Mazeland from comment #2)

Can be resolved by adding a code map in the yaml configuration. Android only
supports two letter codes.

Yep; we don't use "sr".

Can we sort this out? As far as I know Android does support variants for Chinese and Serbian.

This is the current codeMap for the message group out-wikimedia-mobile-wikipedia-android-strings (from WikimediaMobile-android.yaml):

codeMap:
  pt-br: pt-rBR
  zh-hans: zh
  zh-hant: zh-rTW
  qqq: qq

What should be added? sr-ec: sr ? "sr" is on the whitelist, which is probably an issue. That should be sr-ec.

Change 187088 had a related patch set uploaded (by Siebrand):
Fix inconsistencies in the support for Serbian

https://gerrit.wikimedia.org/r/187088

Patch-For-Review

Change 187088 merged by jenkins-bot:
Fix inconsistencies in the support for Serbian

https://gerrit.wikimedia.org/r/187088