webui/src/routes/+layout.ts

import '$lib/style/app.scss';

import { browser } from '$app/environment';
import '$lib/i18n'; // Import to initialize. Important :)
import { locale, waitLocale } from 'svelte-i18n';
import type { LayoutLoad } from './$types';

export const load: LayoutLoad = async () => {
	if (browser && localStorage.getItem('locale')) {
		locale.set(localStorage.getItem('locale'));
	} else if (browser) {
		locale.set(window.navigator.language);
	}
	await waitLocale();
};

export const prerender = true;
export const ssr = false;
export const csr = true;