====Problem
The Universal Language Selector ('ULS') is used as a shortcut to allow users to quickly set language preferences without visiting Special:Preferences.
Currently on production, if a user has set their global preference of interface language and has not enabled a local override the ULS will not successfully set a local override and will therefore fail to display the newly selected language.
The ULS:
{F18754021}
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====Steps to reproduce
1) go to https://meta.wikimedia.org/wiki/Special:GlobalPreferences
2) set language globally and save
3) go to wiki and try to change your language through UniversalLanguageSelector
Result: page get loaded but language is not changed.
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==== Expected behavior
* Changing the language preference in the ULS should enable a local override for that wiki, if the interface language preference is set globally.
{F18754277}