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/es.ts

@@ -389,6 +389,7 @@ export const esTranslation = {
     filterSearchGenres: 'Buscar géneros…',
     filterNoGenres: 'Ningún género coincide',
     filterClear: 'Limpiar',
+    play: 'Reproducir',
     bulkSelected: '{{count}} seleccionados',
     clearSelection: 'Limpiar selección',
     bulkAddToPlaylist: 'Agregar a Lista',