You don't need to translate it, you can choose different languages (top right).

I want to highlight that your translation sounds more professional and less militant (radical?) that the current one I'm seeing in gnusocial.de

>We are a federation of microbloggers who care about ethics and solidarity and want to quit the centralised capitalist services.

"no longer want to use centralized commercial services" sounds better than "want to quit the centralised capitalist services".

Maybe is just me.