List of steps to reproduce (step by step, including full links if applicable):
The link to Special:MobileLanguages appears with a missing translation key ⧼mobilelanguages⧽.
https://codesearch.wmcloud.org/search/?q=mobilelanguages&i=nope&files=&excludeFiles=&repos= returns no results.
What should have happened instead?:
The mobilelanguages i18n key should be defined and translatable.
Software version (if not a Wikimedia wiki), browser information, screenshots, other information, etc: