Feature: #83748 - Show value of fields in debug mode

See forge#83748

Description

If the configuration $GLOBALS['TYPO3_CONF_VARS']['BE']['debug'] is enabled and the current user is an administrator, the value of select, radio and checkbox fields which are generated by the FormEngine is appended to its label.

Impact

The correct name of a field is important to know for developers and integrators. Examples are setting up access permissions or configuration using TsConfig.

Instead of looking into the source code of the browser, it is now possible to display those name by enabling the debug mode for the backend.