TYPO3 Core

Setting the setting:
$GLOBALS['TYPO3_CONF_VARS']['BE']['explicitConfirmationOfTranslation'] = true;

results in the corresponding buttons being added but there are two issues:
1.) SplitButtons.js does not handle buttons / links that start with "_translation_save" in css selectors.
Should add:

'button[name^="_translation_save"]',
'a[data-name^="_translation_save"]',
'button[name="CMD"][value^="_translation_save"]',
'a[data-name="CMD"][data-value^="_translation_save"]'

2.) In \TYPO3\CMS\Backend\Controller\EditDocumentController :
The buttons are created with using:
_translation_savedok
_translation_savedokclear

However, various checks to $_POST check for:
_translation_savedok_x
_translation_savedokclear_x