a11y: Set label instead of name for textarea aria-label value
Summary:
Prefer a field label to a field name for the aria-label parameter value of a textarea element, as that is more descriptive.
Closes T16216
Test Plan:
1. Go to http://phorge.localhost/ponder/question/edit/form/default/
2. Inspect the <textarea> tag of `Answer Summary` which now says `aria-label="Answer Summary"` instead of `aria-label="answerWiki"`
3. Go to http://phorge.localhost/maniphest/task/edit/form/default/ while having a custom text field `Custom Field` defined
4. Inspect the <textarea> tag of `Description` which now says `aria-label="Description"` instead of `aria-label="description"`
5. Inspect the <textarea> tag of `Custom Field` which now says `aria-label="Custom Field"` instead of `aria-label="std:maniphest:custom.field"`
Reviewers: O1 Blessed Committers, mainframe98
Reviewed By: O1 Blessed Committers, mainframe98
Subscribers: tobiaswiese, valerio.bozzolan, Matthew, Cigaryno
Maniphest Tasks: T16216
Differential Revision: https://we.phorge.it/D26730