Delete the content of a language
Removing a language from a site a non-destructive process and the content can be retrieved once the language is added back to the site. Is it possible to completely delete the content of a language?
Yes, that is possible. To do so, you can execute the following query to find all the content related to a certain language in the JCR Query tool:
SELECT * FROM [jnt:translation] WHERE ISDESCENDANTNODE('/sites/digitall') AND [jcr:language]='de'
You can then click on 'Show actions' and delete the content accordingly.