faith: add bilingual routes /glaube ↔ /faith

Add language toggle support for faith pages similar to recipes.
Routes now work in both German and English:
- /glaube ↔ /faith
- /glaube/gebete ↔ /faith/prayers
- /glaube/rosenkranz ↔ /faith/rosary
- /glaube/angelus ↔ /faith/angelus

src/params/rosaryLang.ts

@@ -0,0 +1,5 @@
+import type { ParamMatcher } from '@sveltejs/kit';
+
+export const match: ParamMatcher = (param) => {
+	return param === 'rosary' || param === 'rosenkranz';
+};