Misplaced menu bar items when running in Japanese

[mvf]

On macOS, certain main menu items are moved to the system menu bar by Qt to conform with platform conventions. This is buggy with the current version of the Japanese interface:

1. The 設定 item in the app menu toggles the search settings toolbar while the actual Options item appears in the 設定 menu.
2. The About qolibri item appears under ヘルプ instead of the app menu.