TYPO3 Core

The Fluid ViewHelper f:be.tableList uses the sysext/backend/Classes/RecordList/DatabaseRecordList.php
method makeControl to render a "Delete" button inside record lists.

Clicking on that link uses Build/Sources/TypeScript/backend/ajax-data-handler.ts which localizes
the modal popup contents with either the strings of anchorElement.dataset.buttonCloseText
or TYPO3.lang['button.cancel'] as a fallback.

In the extbase-based backend module, that TYPO3.lang fallback index is not available/set,
and returns a JavaScript error:

VM7262 ajax-data-handler.js:13 Uncaught TypeError: Cannot read properties of undefined (reading 'button.cancel')
    at HTMLButtonElement.<anonymous> (VM7262 ajax-data-handler.js:13:1730)
    at HTMLDocument.<anonymous> (VM7215 regular-event.js:13:433)

To fix this, the makeControl() method now also utilizes not only
data-button-ok-text but also data-button-close-text so that the reliance on
TYPO3.lang no longer is required.

All other methods in the TYPO3 core that set data-button-ok-text always
also populate that data attribute, so this patch streamlines this
bevhaviour.