Steps to reproduce:

1. Switch to a non-English language that has some different letters than English (e.g. Lithuanian, German, Russian, etc.).
2. Open https://grid.glideapps.com/.
3. Click once on any cell.
4. Type any non-English letter with a keyboard (e.g. Lithuanian ž, German ö, or Russian ш). The cell does not enter edit mode.
   Typing the letters that are the same as English enters edit mode.

Tested in browsers:
Google Chrome Version 125.0.6422.113 (Official Build) (64-bit)
Firefox 126.0 (64-bit)
OS:
Windows 11 Pro 23H2 22631.3593