Set $wgForceUIMsgAsContentMsg for zhwikivoyage

So as to allow translation of the <title> element
into various Chinese variants similarly to what
the Chinese Wikipedia does.

Bug: 64816
Change-Id: I8c23184ffbc637050294f37087c3a20eee8a70a5
Merge "Set $wgForceUIMsgAsContentMsg for zhwikivoyage"