Steps to replicate the issue (include links if applicable):

• Navigate to Suggested Edits, Alt Text
• Select Suggest
• Enter more than 125 characters in the description

What happens?:
No warning appears

What should have happened instead?:
The user should see a warning that more than 125 characters have been entered.

Software version (skip for WMF-hosted wikis like Wikipedia):
Tested on 7.4.3 (54)
Other information (browser name/version, screenshots, etc.):