None of those will determine the release date. Do you know how long it takes to change a game's language? 10 minutes? half hour, tops?
Actually, I dont think your 100% right. You can't just do a direct translation from Japanese to any other language and make look professonal. For example the box art of Japanese and US versions will differ. The US version is more likely to talk about NASCAR, than the Japanese version. It happened with FM3, I live in New Zealand and the TV ads talked about the V8 Supercars. Why? Because it is popular in NZ and Australia, unlike USA.