Per https://tools.wmflabs.org/robin/?tool=codelookup&code=kbp and https://translatewiki.net/wiki/Thread:Support/Most_used_messages_have_all_been_translated_into_Kabiye/reply_(13), kbp is rather close to being exported and to meet the language policy requirements.
Related Gerrit Patches:
|mediawiki/core : master||Add kbp language code|
This seems to need an extra effort from the Kabiye contributors, as highlighted at https://translatewiki.net/wiki/Thread:Support/Most_used_messages_have_all_been_translated_into_Kabiye
100 extra messages are needed.