It's your call to translate them when there is no space problem. Maybe put both in English and in Spanish:
Code:
El Explorador (Scout) es la clase más rápida ...
so it' even easier to tell which class you are speaking of.
As for the "help" commands, I can't really tell. I imagine that you don't send that same message, but every client receives the data that you used the FF_MEDENGYMENU_ARMOR/MEDIC/AMMO command and loads it on the same client on it's own language, so everyone will get the message in the language they've set FF (like in TF2, where the Incoming, Go Left, Go, etc. commands are translated to your set language). Would be nice to have some confirmation on this before translating it.