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