Dont treat argument as wikitext

When using Message::parse() arguments passed into the string
are treated as wikitext.  Any time these arguments are provided
by an unsafe source they need to be explicitly marked as 'raw' so
that that are substituted into the i18n string after wikitext parsing
has occured.

Change-Id: I4da934dfe364acb0f87da1c8aed4a4d040d27a05
Merge "Dont treat argument as wikitext" into wmf/1.24wmf20