It tires me a lot to have to "choose" a preferred language for films or series, I speak several languages and therefore consume content in several languages, I don't want one of them to be "the preference" I just want to obtain the content in the original version, is there a way to configure this?

As Radarr and Sonarr check the content on IMDB, they therefore know what the original language of the content is. It should therefore be possible to simply say: I want you to find the film/series for me in the original language.

Edit: So it is indeed possible to dot with Custom Formts on Radarr, it will be available on Sonarr v4 (still in beta), see here: https://trash-guides.info/Radarr/Tips/How-to-setup-language-custom-formats/#language-original-only