@Aeneas Hmm, this is two problems.

1. Pachli should not be showing the translation menu option on fedifreu.de because the server can't translate. That's a Pachli bug, I've noted it at https://github.com/pachli/pachli-android/issues/2173. Thanks for raising this.

2. The 503 error from anoxinon means the server is rejecting the translation request. That's definitely a problem that @Anoxinon will need to investigate (https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/503)