Editing files is blocked by your WordPress configuration

The original message in English is “File modification is disallowed by your WordPress config”. Assuming that we’re discussing the same message – This appears when your site is deliberately preventing updates to a file.

Loco Translate honours the result returned from wp_is_file_mod_allowed. To fix it, you should speak to whoever has decided this should be disallowed. If that person is you, then look at the documentation for wp_is_file_mod_allowed and look at the code that calls it.

This may be as simple as disabling DISALLOW_FILE_MODS but it may be more complex. I can’t tell you about your site.

Loco Translate calls wp_is_file_mod_allowed with the same context that WordPress does when it attempts to update an installed translation file (download_language_pack). That context can be modified with the filter loco_file_mod_allowed_context as shown in the code link above.