Refactor i18n, make component use the hook directly

src/login/i18n/index.ts

@@ -1,2 +1,10 @@
-export type { I18n, MessageKey } from "./i18n";
-export { createUseI18n, fallbackLanguageTag } from "./i18n";
+export type { MessageKey } from "./i18n";
+import { createUseI18n } from "./i18n";
+export { createUseI18n };
+export { fallbackLanguageTag } from "./i18n";
+
+const { useI18n, ofTypeI18n } = createUseI18n({});
+
+export type I18n = typeof ofTypeI18n;
+
+export { useI18n };