Do any of those languages actually have a rule that you're supposed to put a dot in the middle of "et," though? It'd be pretty weird if they did because "et" is one word...

"e.t.c." makes about as much sense as "a.n.d. other things."

(At least the old-fashioned English way of doing it, with a ligature connecting the e and t like so: "&c" was somewhat reasonable.)