You should be able to change the language from File > Options > General > Language. See the manual (Help > About) section 4.3 Language & Localization.
If that doesn’t work and this issue doesn’t get corrected in a timely manner, you can always revert to an older version from here.
To do this, you’ll need to
- note where your projects are stored on your hard drive, as uninstalling Scrivener will delete your Recent Projects list (too many Scrivener users don’t actually know where their projects are kept
) - save your options (File > Options > Manage > Save options to file)
- save your theme, if you’ve customized it (File > Options > Manage > Save theme to file)
- uninstall current Scrivener version
- install prior Scrivener version
- restore your options (File > Options > Manage > Load options from file)
- restore your theme, if you’ve customized it (File > Options > Manage > Load theme from file)
Best,
Jim