Updated mediawiki/extensions
Project: mediawiki/extensions/UniversalLanguageSelector  d38b431d2b9f7bec5344052f209d3f48a7f753ed

Using @custom-browser Cucumber tag instead of @user_agent

Implementing the convention:
https://www.mediawiki.org/wiki/Manual:Coding_conventions/Selenium#Option
al_tags

Bug: 61458
Change-Id: Iac411401a08eadfb04fd43f1d93ce2fd36fbea4a