Updated mediawiki/extensions
Project: mediawiki/extensions/MobileFrontend  191e4195fdbd3f2af88de4d72a84933e64a05011

move loginCaption and signupCaption to correct module

the keys are misleading -
mf-navigation.js actually uses them

Change-Id: Ie7dc4b3fe40c637d3070529d94dcd59b8e884651