Start loaded HUD units hidden

Fixes #408
Resize alien health and poison progressbar images to remove alpha
Fixes #420
Remove unused parameter from R_CullSurface
Remove R_AddBrushModelSurface
Remove unused patch culling stats
Fix GLimp_DebugCallback to work with different versions of GLEW
Selection box description changes.
Download text change.
Let's not translate IRC error messages.
Don't need to translate these IP messages.
Why translate cvar messages?
Removed cl_parse translations
Removed the rest of cl_irc translations.
Removed cl_keys translations.
Removed cl_main translations.
Let's not translate sv_client.
Let's not translate sv_main.
Let's not translate sv_ccmds.
Misc server translation removal.
BaseCommands translation removal.