📝 Update note for untranslated pages (#14257)

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

docs/missing-translation.md

@@ -1,7 +1,9 @@
 /// warning
 
-The current page still doesn't have a translation for this language.
+This page hasn’t been translated into your language yet. 🌍
 
-But you can help translating it: [Contributing](https://fastapi.tiangolo.com/contributing/){.internal-link target=_blank}.
+We’re currently switching to an automated translation system 🤖, which will help keep all translations complete and up to date.
+
+Learn more: [Contributing – Translations](https://fastapi.tiangolo.com/contributing/#translations){.internal-link target=_blank}
 
 ///