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/ru.ts

@@ -401,6 +401,7 @@ export const ruTranslation = {
     filterSearchGenres: 'Поиск жанров…',
     filterNoGenres: 'Нет совпадений',
     filterClear: 'Сбросить',
+    play: 'Воспроизвести',
     bulkSelected: 'Выбрано: {{count}}',
     clearSelection: 'Сбросить выбор',
     bulkAddToPlaylist: 'В плейлист',