Reorder the configured languages to set their order in the language switcher block and, when editing content, in the list of selectable languages. This ordering does not impact detection and selection.
The site default language can also be set. It is not recommended to change the default language on a working site. Configure the Selected language setting on the detection and selection page to change the fallback language for language selection.
Interface translations are automatically imported when a language is added, or when new modules or themes are installed. The report Available translation updates shows the status. Interface text can be customized in the user interface translation page.