just need a quick english-latin translation

It was probably:

Illegitimi Non Carborundum
("Don't let the bastards grind you down")

But it's not really Latin. This is a fake-Latin phrase you see on a lot of
signs and plaques. It is said to have originated with General "Vinegar
Joe" Stilwell who used it as his motto in World War II.

Carborundum is the brand name of an abrasive (silicon carbide).

That's the one. Thanks!