chore: fix useTranslation ci problem which cause error in unit test

Author: moonrailgun

client/shared/i18n/__mocks__/index.ts

@@ -3,3 +3,7 @@ export const t = (key: string) => {
 };
 
 export function onLanguageChanged() {}
+
+export function useTranslation() {
+  return { t };
+}