Breaking: #62983 - postProcessMirrorUrl signal has moved 

See forge#62983

Description 

While refactoring the Language backend module, the \TYPO3\CMS\Lang\Service\UpdateTranslationService::postProcessMirrorUrl signal got lost. Due to the refactoring, it has been integrated in another class.

Impact 

Using the old signal will prevent the slot from being called.

Affected Installations 

All extensions are affected that use the old \TYPO3\CMS\Lang\Service\UpdateTranslationService::postProcessMirrorUrl signal.

Migration 

Change the slot to use the \TYPO3\CMS\Lang\Service\TranslationService::postProcessMirrorUrl signal. If it is required to serve multiple TYPO3 versions, use the following code:

$signalSlotDispatcher->connect(
	version_compare(TYPO3_version, '7.0', '<')
		? 'TYPO3\\CMS\\Lang\\Service\\UpdateTranslationService'
		: 'TYPO3\\CMS\\Lang\\Service\\TranslationService',
	'postProcessMirrorUrl',
	'Vendor\\Extension\\Slots\\CustomMirror',
	'postProcessMirrorUrl'
);
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