added language routing system

src/app/guards/language.guard.ts

@@ -0,0 +1,28 @@
+import { inject } from '@angular/core';
+import { CanActivateFn, Router } from '@angular/router';
+import { LanguageService } from '../services/language.service';
+
+export const languageGuard: CanActivateFn = (route, state) => {
+  const langService = inject(LanguageService);
+  const router = inject(Router);
+  const lang = route.params['lang'];
+
+  const langObj = langService.languages.find(l => l.code === lang);
+
+  if (langObj?.enabled) {
+    // Valid and enabled language — set it and proceed
+    langService.setLanguage(lang);
+    return true;
+  }
+
+  const defaultLang = langService.currentLanguage();
+
+  if (langObj && !langObj.enabled) {
+    // Known but disabled language — redirect to default lang, keep the rest of the path
+    const pathAfterLang = state.url.slice(1 + lang.length);
+    return router.createUrlTree([`/${defaultLang}${pathAfterLang}`]);
+  }
+
+  // Not a recognized language code — treat as a legacy URL without lang prefix
+  return router.createUrlTree([`/${defaultLang}${state.url}`]);
+};