Yes, though the number of additional bits you get from increasing the size of the dictionary decreases fast. E.g. suppose English and German have the same number of words, then using both only gives you one more bit per word.
(Actually, slightly less since some words exist in both languages. Like `hell'.)
>Yes, though the number of additional bits you get from increasing the size of the dictionary decreases fast.
Well, sure -- but once you're at around two or three languages, you get to imagine that the attacker doesn't know what languages you're using. If I use English, Japanese, and Spanish, I can figure on the attacker needing to check the Germanic (English, Dutch, German), Romance (Spanish, French, Italian), and Asian (Japanese, Chinese, Korean) languages at a minimum.
Jargon helps too, and proper names. "dijkstra bicycle entonces boojum daihinmin"
(Actually, slightly less since some words exist in both languages. Like `hell'.)