Hi @n4nD09o,
This is our understanding of the problem you are facing :
If German user1 uploads a media and adds a comment [ Kommentar in Deutsch ] in the language German.
Spanish user2 visits his website to view the post and comment added by German user1 but finds the comment as [ Kommentar in Deutsch ] instead of [ comentar en alemán ].
If above is the question you wanted to ask then this is the expected behaviour as the comment-content cannot be translated by the plugin / theme in prior. We can suggest you to use browser translator which can help you to translate the whole webpage.
In another case, if you are asking in regards to any text / button / link which is part of our plugin then please share a screenshot so that we can help you with the translation issue.
Thank you.