This currently only works if you have your ordering set to TMDB.
We’re hoping to enable it for TVDB also at some point as we migrate to their new API but cannot tell you when that will be.
You can however set the episode ordering manually on a per-show basis (if you wish for TVDB to remain the default for other shows). So if you wanted to enable it for AHS then you can do the following:
Edit the Show by clicking to pencil icon.
Navigate to “Advanced”.
Set “Episode ordering” to “The Movie Database (Aired)”.
The show should automatically refresh after this and you should get your season titles and descriptions.
Also you’d have to ensure that TMDB has the appropriate translations for your set language.