languages/overrides/{app}/{lang_code}/{constant_id}

DELETE {{base_url}}/{{base_path}}/languages/overrides/:app/:lang_code/:constant_id

Generated from a curl request: curl -X DELETE '{{baseurl}}/{{basepath}}/languages/overrides/{{app}}/{{langcode}}/{{constantid}}' -H 'X-Joomla-Token: {{auth_apikey}}'