Achievements: Add leaderboard toggle (+ some minor fixes)

Overhaul japanese translation (stenzek#2829)

* update base duckstation-qt_ja.ts

* add white-space between Japanese and English

* replace zenkaku parenthesis and colon with hankaku

* unify wording (memory card, controller), fix okurigana for assign/load

* overhaul Japanese translation

Co-authored-by: Dolphin <dolphin@torikara.org>

Create windows-build.yml