fix: return baseUrls if no uid is given to language switcher query

constants/routes/baseUrls.ts

@@ -0,0 +1,10 @@
+import { LanguageSwitcherData } from "@/types/requests/languageSwitcher"
+
+export const baseUrls: LanguageSwitcherData = {
+  da: { url: "/da/" },
+  de: { url: "/de/" },
+  en: { url: "/en/" },
+  fi: { url: "/fi/" },
+  no: { url: "/no/" },
+  sv: { url: "/sv/" },
+}