feat: web i18n (#1286)

apps/web/src/middleware.ts

@@ -5,9 +5,10 @@ import { NextResponse } from 'next/server';
 import { getToken } from 'next-auth/jwt';
 
 import { TEAM_URL_ROOT_REGEX } from '@documenso/lib/constants/teams';
+import { extractSupportedLanguage } from '@documenso/lib/utils/i18n';
 import { formatDocumentsPath } from '@documenso/lib/utils/teams';
 
-export default async function middleware(req: NextRequest) {
+async function middleware(req: NextRequest): Promise<NextResponse> {
   const preferredTeamUrl = cookies().get('preferred-team-url');
 
   const referrer = req.headers.get('referer');
@@ -78,6 +79,19 @@ export default async function middleware(req: NextRequest) {
   return NextResponse.next();
 }
 
+export default async function middlewareWrapper(req: NextRequest) {
+  const response = await middleware(req);
+
+  const lang = extractSupportedLanguage({
+    headers: req.headers,
+    cookies: cookies(),
+  });
+
+  response.cookies.set('i18n', lang);
+
+  return response;
+}
+
 export const config = {
   matcher: [
     /*