Fix translation placeholder in German locale

- Corrected placeholder from {{Anbieter}} to {{provider}}

src/lib/i18n/locales/de-DE/translation.json

@@ -130,7 +130,7 @@
 	"Content Extraction": "Inhaltsextraktion",
 	"Context Length": "Kontextlänge",
 	"Continue Response": "Antwort fortsetzen",
-	"Continue with {{provider}}": "Mit {{Anbieter}} fortfahren",
+	"Continue with {{provider}}": "Mit {{provider}} fortfahren",
 	"Controls": "",
 	"Copied shared chat URL to clipboard!": "Freigabelink in die Zwischenablage kopiert!",
 	"Copy": "Kopieren",