v1.2 & v1.3

Update RC v1.2:

• Fixed the chainsaw marine sprites, the marine showed the default PLAY sprites insted of the custom ones
• Fixed the error messages on startup on maps MAP02, MAP03, MAP04 and MAP05

Update RC v1.3:

• Added a menu to change language without have to start the game again or change the CVAR in the console. Also for enabling/disabling fullscreen shaders.
• Improved navigation at MAP03 ending part
• Added the computer shader to the computer part on MAP06