In Options --> Language..., the option for Japanese says "日本語 (私たち)". This translates to "Japanese (we)". I believe it should say "日本語 (日本)", meaning "Japanese (Japan)"
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It actually translates to "Japanese (us)".
Otherwise, based on another ticket which is similar to this (MC-62533), this is a language translation request, which isn't supported here. Please go here: https://crowdin.net/project/minecraft
migrated
Japanese "actually" can't be translated by Google Translate. 私たち is any group that you're a part of, whether it's "we", "us", or "my corporation". A for effort, though.
kumasasa
Invalid, but already fixed in 1.8, see screenshot.