Feature: #85410 - Allow TCA description property

See Issue #85410

Description

The new TCA property description on column field level has been introduced. The value data type is a localized string, similar and on the same level as label.

The property can be used to display an additional help text between the field label and the user input when editing records. As an example, the core uses the description property in the site configuration module when editing a site on some properties like identifier.

The property is available on all common TCA types like input and select and so on.

Example:

'columns' => [
    'myField' => [
        'label' => 'My label',
        'description' => 'LLL:EXT:my_ext/Resources/Private/Language/locallang_tca.xlf:field.description',
        'config' => [
            'type' => 'input',
        ],
    ],
],

Impact

The change is fully backwards compatible and can be used by integrators or administrators to hint editors for expected field input.