Render namespace lists in the user's language

Render namespace lists in the user's language

Asking users to select from a list that is in a namespace
other than their user language can be quite difficult.
Transition a number of use cases. This was applied via a flag
to avoid unexpectedly changing extensions also utilizing
the namespace selector.

Pages updated:
* Special:Search
* Special:Watchlist
* Special:RecentChanges
* Special:Contributions
* Special:Import
* Special:WhatLinksHere

Bug: T174057
Change-Id: I3fdac72179a124849ef7ad1e0e54eb66396c3c6e