Update translations with new empty state message

Added translation for "No products available for selection" message in all 6 locales:
- de_DE (formal): Keine Produkte zur Auswahl verfügbar. Bitte konfigurieren Sie...
- de_DE_informal: ...Bitte konfiguriere...
- de_CH (formal): ...Bitte konfigurieren Sie...
- de_CH_informal: ...Bitte konfiguriere...
- fr_CH: Aucun produit disponible pour la sélection...
- it_CH: Nessun prodotto disponibile per la selezione...

Recompiled all .mo files.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

languages/wc-composable-product.pot

@@ -237,3 +237,7 @@ msgstr ""
 #: templates/product-selector.twig
 msgid "In stock"
 msgstr ""
+
+#: templates/product-selector.twig
+msgid "No products available for selection. Please configure the product criteria in the admin panel."
+msgstr ""