How to change the language of SuperOffice Ribbons and MailLink

SuperOffice Ribbons and MailLink use the HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Common\LanguageResources\UIFallback to determine which language to use (the example is for Office 2016). Registry can have these values 0;1031;1033;1044;1043;1030;1053 SuperOffice will choose the first valid value and if you have this language pack installed the SuperOffice Ribbon/MailLink will be shown in this language.

Language code	Language
1031	German
1033	English
1044	Norwegian
1043	Dutch
1030	Danish
1053	Swedish

You need to do this for every user on the server as the setting is user-specific.