Cannot translate a content type "The configuration objects have different language codes so they cannot be translated" I cannot translate a content type

The configuration objects have different language codes so they cannot be translated:
node.type.article : fr
core.base_field_override.node.article.title : en

I think it was because by mistake the article was created in French then after I go back to en... But I don't know how to change it ? 

I tried to fix this via drush : 

drush cset node.type.article langcode en   


but it doesn't seems to work so I would like to know how to fix it via the admin ?
Export the configuration:

drush cex


then change the langcode in sites/default/files/config_HASH/sync and import the configuration again:

drush cim


Look for all non english langcodes that are in the base sync folder (or non default langcode, if you have another default language).