System: Fix inverted save screenshot colour channels

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 <[email protected]>

Create windows-build.yml