I propose to approve Bashkir Wikibooks.
The test-project is active since 8 months: < https://tools.wmflabs.org/meta/catanalysis/index.php?cat=0&title=Wb/ba&a...
[As Bashkir Wikipedia already exists,] the most-used messages are already translated. Looking at < https://translatewiki.net/wiki/Special:SupportedLanguages/ba#ba%3E I think it is appropriate to say that there is a continuing effort to translate the interface, so that that requirement is also fulfilled.