Adds Swedish (sv, Svenska) as an interface language. The catalog combines
the open Swedish catalogs of #5985 and #9536: each row takes the best of
their translations, with one Swedish term per concept across the UI and
the reference application's established Swedish terms where they are
unambiguous, and the strings added since are filled in. 4,537 rows, every
measured key; plural rule one|other.
Where the rows come from: 2,710 both catalogs agreed on, 979 from #5985,
655 from #9536, 193 written new; 177 of the taken rows
were edited for consistency.
The tests that used sv-SE as an unsupported locale now use sw-KE and
fi-FI, and sv-SE / sv_FI.UTF-8 are positive cases. macOS lists sv in
CFBundleLocalizations.
Fixes#10020.
Co-authored-by: kler <966132+kler@users.noreply.github.com>
Co-authored-by: davvarn <1687962+davvarn@users.noreply.github.com>
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
