feat: add support for translations (#349)

Co-authored-by: Kyle Mendell <kmendell@outlook.com>
Co-authored-by: Elias Schneider <login@eliasschneider.com>

frontend/src/lib/stores/user-store.ts

@@ -1,9 +1,13 @@
+import { setLocale } from '$lib/paraglide/runtime';
 import type { User } from '$lib/types/user.type';
 import { writable } from 'svelte/store';
 
 const userStore = writable<User | null>(null);
 
 const setUser = (user: User) => {
+	if (user.locale) {
+		setLocale(user.locale, { reload: false });
+	}
 	userStore.set(user);
 };