In normal cases Nextcloud will automatically detect the language of the Web-GUI.
If this does not work properly or you want to make sure that Nextcloud always
starts with a given language, you can set a default_language parameter in the
The default_language paramenter is only used, when the browser does not send any language, and the user hasn’t configured own language preferences.
<?php "default_language" => "en",
If you want to force a specific language, users will no longer be able to change
their language in the personal settings. You can set a force_language parameter
<?php "force_language" => "en",
If users shall be unable to change their language, but users have different languages,
this value can be set to
true instead of a language code.
Please check Transifex language codes for the list of valid language codes.