### What problem does this PR solve?

Update all test file creation functions to use English text instead of
Chinese for consistency with the project's language standards. This
includes DOCX, Excel, PPT, PDF, TXT, MD, JSON, EML, and HTML test file
generators.

### Type of change

- [x] Update test case

### What problem does this PR solve?

Move test cases only - CI still runs tests under sdk/python

### Type of change

- [x] Refactoring