[4.3] Massmail: Fix validation

[Hackwar]

Pull Request for Issue #33450.

Summary of Changes

Please see the original issue for the problem. Simply said, the mass mail feature has a custom, stupid form validation. This PR uses the default Joomla validation and also the default markup.

Testing Instructions

1. Go to mass mail in the users menu.
2. Click on "Send Mail" (without filling out any data)

Actual result BEFORE applying this Pull Request

The form is not send and you get a blue box stating an error. Clicking again will add yet another blue box each time.

Expected result AFTER applying this Pull Request

Sending the form is prevented and all invalid fields are marked red. In addition, there is a message at the top. Clicking again will re-validate and only display one message at the top.

Link to documentations

Please select:

• No documentation changes for docs.joomla.org needed
• Pull Request link for manual.joomla.org: Deprecate massmail error strings Manual#68

[Quy]

Add padding/spacing.

[Hackwar]

@Quy done

[richard67]

I have tested this item ✅ successfully on 5e9c489

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[richard67]

The deleted JS file will be added to the list of files to be deleted on update in script.php with another PR. I will care for that.

[MacJoom]

I have tested this item ✅ successfully on 5e9c489

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[richard67]

RTC

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[obuisard]

Thank you Hannes @Hackwar for the PR!

[HLeithner]

Documentation PR is wrong because it misses the removed JS file... this PR should have not been merged with a wrong documentation PR, also the documentation PR has to be merged at the same time as the PR it self....

[Hackwar]

Are you saying that we can't remove the JS? Or just to extend the documentation PR?

[richard67]

Are you saying that we can't remove the JS? Or just to extend the documentation PR?

@Hackwar That's actually subject of discussion in the maintainers channel on Mattermost and in my PR #39413 and in my previous PR #39408 .