Issue Summary

The "aria-label" attribute is defined inappropriately.

Element name:

• Add Watchers

Location of the element: Editable Combobox, in the "Add Watchers" popup, in the "People" heading section, in the main content.

Steps to Reproduce

1. Open an issue
2. Click on the Watchers counter – the Add Watchers popup dialog appears
3. Inspect the code for mentioned instance and observe that the aria attribute is defined inappropriately.

Expected Results

The "aria-label" attribute is defined inappropriately for the "Add Watchers" input field. The visible label is associated with the input field using "for" and "id" explicitly. The "aria-label" attribute overrides the visible text which confuses the screen reader user.
Note: the users list in aria-label is also important, see the linked ticket & Slack discussion for more context 

Actual Results

Remove the "aria-label" attribute from the input field's source code. The visible label should be announced with the input field.

<label class="js-add-watchers-label" for="watchers-textarea">Add Watchers</label>
(...)
<textarea autocomplete="off" role="combobox" aria-autocomplete="list" aria-expanded="false" id="watchers-textarea" class="text long-field" wrap="off" aria-multiline="false"></textarea>

Workaround

Currently there is no known workaround for this behavior. A workaround will be added here when available