doc: add tips for translation

Author: love-linger

README.md

@@ -49,6 +49,9 @@
 
 [![en_US](https://img.shields.io/badge/en__US-100%25-brightgreen)](TRANSLATION.md) [![de__DE](https://img.shields.io/badge/de__DE-99.86%25-yellow)](TRANSLATION.md) [![es__ES](https://img.shields.io/badge/es__ES-99.86%25-yellow)](TRANSLATION.md) [![fr__FR](https://img.shields.io/badge/fr__FR-94.87%25-yellow)](TRANSLATION.md) [![it__IT](https://img.shields.io/badge/it__IT-95.42%25-yellow)](TRANSLATION.md) [![pt__BR](https://img.shields.io/badge/pt__BR-96.67%25-yellow)](TRANSLATION.md) [![ru__RU](https://img.shields.io/badge/ru__RU-100.00%25-brightgreen)](TRANSLATION.md) [![zh__CN](https://img.shields.io/badge/zh__CN-100.00%25-brightgreen)](TRANSLATION.md) [![zh__TW](https://img.shields.io/badge/zh__TW-100.00%25-brightgreen)](TRANSLATION.md)
 
+> [!NOTE]
+> You can find the missing keys in [TRANSLATION.md](TRANSLATION.md)
+
 ## How to Use
 
 **To use this tool, you need to install Git(>=2.23.0) first.**