The language button instrumentation is being disabled in 130849. The module is being kept, however. This task is about removing the leftover module from extension two weeks after the code has been pushed to production. The reasoning is that we want to keep module names around if something goes wrong and needs a revert. See https://www.mediawiki.org/wiki/Reading/Web/Team/Pushing_production_code_from_beta_to_stable#Signing_off_changes for more info.
bmansurov mentioned this in T130849: Clean up language button related code on mobile web (instrumentation + old feature flagged code).Apr 4 2016, 4:57 PM2016-04-04 16:57:41 (UTC+0)