Messages with links in it must be parsed

Otherwise something like
"There is [/wiki/File:Amphoe_Sukhothai.svg another file] already on the
wiki with the same filename"
is returned and shown as such to the user.

C.f. http://www.mediawiki.org/wiki/RL/DM#mediaWiki.message

Also using title as reported by API instead of title that was entered by
user because the user possibly knows what they were entering but the
file that exists under a normalized name may be unknown but interesting
to the user.

Bug: 47935
Change-Id: Ie5a153a23cf2cbaa52456a2e48b8c828247b86b0
Merge "Messages with links in it must be parsed"