Fallback/overrule default site language
If no content is available for the default language, you have the option to fallback and show the content from another language or the other way around.
Option 1: Fallback
"Select fallback language(s) that will be used for the content when it is not available in the default language"
Option 2: Overrule
"Select language(s) that should be used instead of the default language, when possible"