Updated mediawiki/extensions
Project: mediawiki/extensions/Math  f420e06763e7a850a63458087c4afca3e518f483

Set menuSettings.locale

That one is necessary, and MathJax.Localization.locale will copy it automatically.

Bug: 35038
Change-Id: I4e21cc5cdcb0d7a31a97b3b136d725f67a53f75c