[4.4] Form Text Field: Translate text for frontend validation

[Hackwar]

Pull Request for Issue #42919 .

Summary of Changes

The validation text for frontend validation right now is not translated.

Testing Instructions

Codereview

Link to documentations

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[dgrammatiko]

The way to set the data attributes of an element should be done through the existing API. The existing code predates the API...
In sort this should be done differently

[Hackwar]

That might be, however that would be a refactoring and a new feature, which we can only really do in a major or minor release, not in a patch release. Fixing the bug for now however would be possible for 4.4, which means people on 4.4 and 5.1 would both benefit from this now instead of having to wait for 5.2.

[dgrammatiko]

I'm not sure what's the new feature here. All I said is that instead changing this in the layout you should doit in the form class. The same conditional, essentially the same code, but in the right place using the existing API for the data.
Anyways, monkey patching is also fine...

[brianteeman]

I have tested this item ✅ successfully on ebd2d9f

tested by adding validationtext="JGLOBAL_TITLE" to the title field of administrator\components\com_content\forms\article.xml

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[Quy]

I have tested this item ✅ successfully on ebd2d9f

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[Quy]

RTC

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[brianteeman]

I have tested this item 🔴 unsuccessfully on ebd2d9f

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[brianteeman]

changed my test result as it needs to be escaped as Fedir pointed out.

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[Hackwar]

@Quy @brianteeman I escaped the string. Would you be able to test this again?

[Fedik]

I have tested this item ✅ successfully on 8baa931

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[fgsw]

I have tested this item ✅ successfully on 8baa931

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[Quy]

RTC

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[laoneo]

Thanks!