Last modified: 2014-02-20 23:47:45 UTC
This is related to bug 38129. The alt text box in the media dialog is only about two-thirds the width of the screen, with no possibility of wrapping/scrolling down. Maybe eight words fit in it (two-thirds of the example given in the lead of https://en.wikipedia.org/wiki/WP:ALT). It should be at least the normal width of the dialog.
Change 114022 had a related patch set uploaded by Mooeypoo: Make alternate text input stretch to full width https://gerrit.wikimedia.org/r/114022
Change 114022 merged by jenkins-bot: Make alternate text input stretch to full width https://gerrit.wikimedia.org/r/114022
Verified the fix in test2