ok if you want to add a custom text to the Team which has won or loose simply add a new file to your raw Files exactly in ff/english/localizedstrings and name it mp.str and paste the following in it:
// eXtreme+ mp messages at the end of the round string file
REFERENCE DRAW
LANG_ENGLISH "^5AWESOME ^3MATCH ^5!!!"
REFERENCE VICTORY
LANG_ENGLISH "^5GOOD ^3GAME ^5TEAM ^3!!!"
REFERENCE DEFEAT
LANG_ENGLISH "^5BETTER ^3LUCK ^5NEXT ^3TIME"
ENDMARKER
you can change the LANG_ENGLISH vars to have it your way.
after that edit your mod.csv and add this to the part where you find the localize entries:
localize,mp
compile your mod and have fun !