update japanese translation without gerrit
add japanese translation of gerrit
fix newline format

unify newline format to CRLF
unify translation for Pull Request
unify translation for remote commands

translations of remote access commands and Fork are assigned the English
words as it is.

- Pull, プル -> Pull
- Push, プッシュ -> Push
- クローン -> Clone
- フェッチ -> Fetch
- フォーク -> Fork
fix untranslated text
fix key shortcut