ajp RTL

Indeed. Once you get to 13% of core messages, it will be properly defined as RTL. There's no convenient way to do it before that. Sorry about the inconvenience. Just continue with the Most used messages, and you'll get there.

Got it. Is it 13% of "MediaWiki (most important messages)" ( https://translatewiki.net/wiki/Special:Translate?filter=%21translated&action=translate&language=ajp&group=core-0-mostused ) or 13% of MediaWiki core ( https://translatewiki.net/wiki/Special:Translate?filter=%21translated&action=translate&language=ajp&group=core )?

When I write "13% of core", I mean "13% of core" :)

About 500 messages.

Haha got it :)

So if we translate all "MediaWiki (most important messages)" (about 500 messages?) that should be enough to cover "13% of core"? (I assume that "MediaWiki (most important messages)" is a subset of "MediaWiki core"?)