FIX re-label forgot password for uniq id

[andrewandante]

Description

Defaults for non-Email unique identifier fields, including a TextField in the form and a sensible label.

Manual testing steps

Set unique_identifier_field to something non-email.
See that it changes the field label.

Issues

Fixes #11567

Pull request checklist

• The target branch is correct
  • See picking the right version
• All commits are relevant to the purpose of the PR (e.g. no debug statements, unrelated refactoring, or arbitrary linting)
  • Small amounts of additional linting are usually okay, but if it makes it hard to concentrate on the relevant changes, ask for the unrelated changes to be reverted, and submitted as a separate PR.
• The commit messages follow our commit message guidelines
• The PR follows our contribution guidelines
• Code changes follow our coding conventions
• This change is covered with tests (or tests aren't necessary for this change)
• Any relevant User Help/Developer documentation is updated; for impactful changes, information is added to the changelog for the intended release
• CI is green

[GuySartorelli]

LGTM - just noticed the branch this is targetting. No sense in this waiting until June - can you please retarget to 5.3 so it can be released as a patch?

Would be really good if you can include a unit test as well, if you have time.

[andrewandante]

Alrighty @GuySartorelli I think I'm done messing about 😄

[GuySartorelli]

LGTM, thanks for this