HOUI prefixes some strings with "@_"

[emoose]

Some strings get prefixed with "@_":

• If you get negative score it'll be shown on the podium as "@_-1"
• Editing strings in the SSL files can sometimes make "@_" appear in front, eg editing "ingame_ui_leave_game" to "HALO 3 MENU" shows up as "@_HALO 3 MENU"

Seems like it tries looking it up as a string ID, if it can't find it then it puts "@_" in front for some reason.

[Shockfire]

Not really sure how we can fix this. For fixing the podium scoring we could maybe look at how scores are bound to the main scoreboard, since negative numbers work there.