When user is inserting text into Something Else field or Additional Details field and the character counter starts counting in descending order, the user is able to enter an unlimited amount of text into the text fields, but these text fields should not allow more than 500 characters to be inserted, also when the character counter appears its going beyond 0 and will continue counting in descending order using negative numbers such as -1 -2 -3 and so on.

Steps to reproduce:

1. Open any beta wiki url
2. Log in with a user that has at least 1 edit
3. Go to a User Talk page
4. Select the Report option
5. Select Proceed to File A Report
6. Start inserting text into the Additional Details field and and when you have inserted at least 400 characters you will see the character counter appear on the bottom left or right corner of the text field (depending upon which language beta you are using).
7. When you have inserted more than 500 characters you will notice the counter shows a negative count instead of stopping at 0, and you are still allowed to enter more than 500 characters into each text field.

Expected Result:
User should not be able to enter more than 500 characters into either text field, and the character counter should stop at 0 when you try to insert more than 500 characters.