core&ui: add contest language limit (#1014)

Co-authored-by: panda <panda_dtdyy@outlook.com>

packages/ui-default/pages/domain_edit.page.tsx

@@ -0,0 +1,8 @@
+import LanguageSelectAutoComplete from 'vj/components/autocomplete/LanguageSelectAutoComplete';
+import { NamedPage } from 'vj/misc/Page';
+
+const page = new NamedPage('domain_edit', () => {
+  LanguageSelectAutoComplete.getOrConstruct($('[name=langs]'), { multi: true });
+});
+
+export default page;