[Mediawiki-api] adding action=getmsg

[Michael Dale]

Brad Jorsch wrote:
> ... depending on the message....
yea your email highlights how things really have to be handled on a per 
msg basis. The parser function {{int:msgname|param}} that Roan pointed 
out will work for my existing use cases. Eventually we will need to 
paralyze a few of our language functions into JS. But we will have to 
handle this on a per msg basis.

--michael