How to reproduce :
- in a content, select a whole word
- click on "Link" button, then "add a link to a page managed by Ametys",
- select a page
- then try to add an alternative : the field is disabled
Note that, the field is not disabled if you do not select the whole word but only let the cursor on the word.
It always been like this
To edit a link, do not select it in entier
Just put the cursor in it
IMO I think, the issue that I will fix is to make the ribbon tab not displayed in that case