Feature: #103090 - Make link type label configurable

Description

It is now possible to provide a translated label for custom link types.

For this, a new interface \TYPO3\CMS\Linkvalidator\Linktype\LabelledLinktypeInterface has been created, which offers the method getReadableName for implementation. That method can return the translated label.

The default abstract implementation \TYPO3\CMS\Linkvalidator\Linktype\AbstractLinktype has been enhanced to implement that interface. Any custom class extending this abstract is able to override the method getReadableName to provide the custom translation.

Example extending the abstract:

EXT:extension/Classes/Linktype/CustomLinktype.php

use TYPO3\CMS\Linkvalidator\Linktype\AbstractLinktype;

#[Autoconfigure(public: true)]
class CustomLinktype extends AbstractLinktype
{
    public function getReadableName(): string
    {
        $type = $this->getIdentifier();
        return $this->getLanguageService()->sL(
            'LLL:EXT:linkvalidator_example/Resources/Private/Language/Module/locallang.xlf:linktype_'
            . $type
        ) ?: $type;
    }
}

Example implementing the interface:

EXT:extension/Classes/Linktype/CustomLinktype.php

use TYPO3\CMS\Linkvalidator\Linktype\LinktypeInterface;
use TYPO3\CMS\Linkvalidator\Linktype\LabelledLinktypeInterface;

#[Autoconfigure(public: true)]
class CustomLinktype implements LinktypeInterface, LabelledLinktypeInterface
{
    // implement all LinktypeInterface methods:
    // getIdentifier, checkLink, setAdditionalConfig, ...

    // Implement the LabelledLinktypeInterface method getReadableName()
    public function getReadableName(): string
    {
        $type = $this->getIdentifier();
        return $this->getLanguageService()->sL(
            'LLL:EXT:linkvalidator_example/Resources/Private/Language/Module/locallang.xlf:linktype_'
            . $type
        ) ?: $type;
    }
}

Impact

Custom linktype classes should now configure a label by implementing the method LabelledLinktypeInterface::getReadableName().

All existing custom implementations of the AbstractLinktype class or the LabelledLinktypeInterface will continue to work as before, and will just continue to use the internal name of the link type, instead of a translated label.