How to make image alternative text as required be more web accessibility? In Drupal 7, how can I set image alternative text as required in "Body" field (CKEditor), "image" field and file upload by using "Media" module?

---- updated info for betherwisser on Aug. 20, 2014 @ 12:17pm
I know there is a file types section in Media but it is different from what you mentioned. However, It does not have the Alt text field option there. Please see screenshot for details.


ALSO, there is an option on image file for Alt Text but I'm not able to make that as required. See below screenshot.
I found one of the solution by using EIM module. I understand this is not the best solution but this module able to enable Alt field required on image field by content type.

---- updated info on Aug. 22nd 2014 @ 11:12pm
The EIM module adds checkboxes for the fields of image editing forms by content type. Including "Alt field required" and "Title field required". See below screenshot for details.