feat(i18n): static type on i18n (#2225)

vitest.config.ts

@@ -19,6 +19,7 @@ export default defineConfig({
   test: {
     setupFiles: [
       resolve(rootDir, './scripts/setup/lit.ts'),
+      resolve(rootDir, './scripts/setup/i18n.ts'),
       resolve(rootDir, './scripts/setup/search.ts'),
       resolve(rootDir, './scripts/setup/lottie-web.ts'),
     ],