[6.0] Passwort reset request: fix legend

[chmst]

Pull Request for Issue #46446

Summary of Changes

This PR sepaprates Legend of the fieldset and label of a field

Testing Instructions

I a frontend login form click the "forgot password" link.

Actual result BEFORE applying this Pull Request

The label of the fieldset is used for a legend. If there is no label, there would not be a legend at all, which is an a11y issue.
A legend is not an instruction but summarises the content of a fieldset.
This PR adds a legend for the fieldset, if there is a label or not.

### Expected result AFTER applying this Pull Request

Note:
If this is accepted, same change is needed for similiar pages.

Link to documentations

Please select:

• Documentation link for docs.joomla.org:

• No documentation changes for docs.joomla.org needed

• Pull Request link for manual.joomla.org:

• No documentation changes for manual.joomla.org needed

[Kostelano]

The same issue is on the Login reminder page.
Can we fix this and do the same?

[brianteeman]

@Kostelano it already says that

[Kostelano]

@Kostelano it already says that

I didn't see it at first, now I see it

[ChristineWk]

I have tested this item ✅ successfully on 70e4a33

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_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/46451.}

[richard67]

@chmst If this PR is a bug fix, it should be made for 5.4-dev if it effects both 5.4 and 6.0, and it seems that's the case. And if it is a new feature it should be made for 6.1-dev. So I don't really understand why you have made it for 6.0-dev.

[chmst]

It is an enhancment.

[brianteeman]

it has to be made for 6.1 because there is a NEW language string (unfortunately)

[brianteeman]

But it could be made for 5.4 if you re-use the existing string COM_USERS_RESET which for me would be better as it really is a bug fix.

[chmst]

Thanks @brianteeman, will do this. I also see that the fieldset label is not necessary at all.

[chmst]

Closing for #46454