fix(i18n): add common.play key to all 8 locales (fix for PR #186)

The AlbumHeader and PlaylistDetail play buttons use t('common.play') which
was missing — 'Reproducir' would have appeared as fallback in all languages.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/locales/nb.ts

@@ -387,6 +387,7 @@ export const nbTranslation = {
     filterSearchGenres: 'Søk i sjangre…',
     filterNoGenres: 'Ingen sjangre samsvarer',
     filterClear: 'Tøm',
+    play: 'Spill',
     bulkSelected: '{{count}} valgt',
     clearSelection: 'Fjern utvalg',
     bulkAddToPlaylist: 'Legg til i spilleliste',