When JavaScript is disabled or not completely loaded, clicking the "edit" button related to label and description of the MediaInfo entity leads to SetLabelDescriptionAliases special page. I assume this is basically copied from the frontend code related to items and properties.

With MediaInfo entities not having aliases two problems arise:

• existing label/description are not pre-filled in the special page form
• submitting the form is not possible; I assume this is because of lack aliases in MediaInfos, Special page codes says "no". Nevertheless, no error message is displayed to the user.

Possible solutions would be to adjust the special page to handle entities that don't have aliases (which seems like the contrary to why the special page is there in the first place), or change the non-JS behaviour of the edit link (it should possibly lead to some other special page that only handles labels and descriptions?),