Clarify repository language requirement

Emphasize that the repository language is English for all aspects including code, comments, and documentation.

Author: softhack007

AGENTS.md

@@ -233,7 +233,7 @@ No automated linting is configured. Match existing code style in files you edit.
 
 ## General Rules
 
-- Repository language is English.
+- Important: Repository language is **English**. This applies to source code (including comments), commit messages and any kind of documentation for developer or users.
 - The `docs/` folder is for developer/contributor information (coding conventions, architecture, etc.). User documentation is maintained in the [wled/WLED-Docs](https://github.com/wled/WLED-Docs) repository.
 - Never edit or commit auto-generated `wled00/html_*.h` / `wled00/js_*.h`.
 - When updating an existing PR, retain the original description. Only modify it to ensure technical accuracy. Add change logs after the existing description.