[Bug]: Review Swedish localization and macOS bundle handling from PR #848 #970

Summary

The Swedish VirtualBox GUI catalog and the macOS bundle localization handling need review.

Pull request #848 provides the implementation:

• completes the Swedish GUI and Qt catalogs against the current source set;
• preserves Qt placeholders and validates the catalog with makeallnls and lrelease;
• adds the missing .lproj directories to the nested VirtualBoxVM.app bundle, matching the handling already used by the outer Manager app.

The macOS localization part addresses the nested VM bundle specifically. The official Apple Silicon package contains Swedish QM catalogs, but its nested VM app has no language-specific .lproj directories.

Please review and consider merging PR #848.