Why do you want to install all the language packs?
I do not think they'll be included by default, as
1. WSUSOU's focus is not on optional updates, but security, and
2. there's little benefit as these will only work for Ultimate and Enterprise editions.
Of course you are free to include them yourself. Note that it's no problem to create a multi-language installation DVD, this is the best variant (desktop language selection in setup works for all editions and is allowed by MS).