Fixed tooltip entity name and optimised handler loop on safari nets.

The name fix should handle non-MFR mobs just fine, assuming they have appropriate translation entries (but they'd need those, anyway, for death messages, etc). Handles vanilla mobs across the board.

Also, I only added "Pink Slime" to the en_US language file. Didn't know if dummy entries needed added to the others, too, so I simply left them alone.

The loop optimisation is minor; it's just a single class-mapping lookup instead of every loop iteration (and exits even before the loop, if the mapping is bogus).