Fixed bad XML that was checked into strings.xml.
Fixed bad XML that was checked into strings.xml.

This caused lots of fallout, like menu accelerators appearing as
"missing_string(accel-win-ctrl)" instead of "Ctrl+". The offending
line was the ATTACH_HUD_CENTER_2 string, which had a messed up XML
close tag.

gabeharms/firestorm,gabeharms/firestorm,gabeharms/firestorm,gabeharms/firestorm,gabeharms/firestorm,gabeharms/firestorm,gabeharms/firestorm,gabeharms/firestorm,gabeharms/firestorm