Add hint to dynamically load language from backend user in cli (#5355)

Author: jankornblum

Documentation/ApiOverview/Backend/BackendUserObject.rst

@@ -14,7 +14,7 @@ as the global variable :php:`$GLOBALS['BE_USER']`. The object is created in
 and is an instance of the class :php:`\TYPO3\CMS\Core\Authentication\BackendUserAuthentication`
 (which extends :php:`\TYPO3\CMS\Core\Authentication\AbstractUserAuthentication`).
 
-When working with CLI and commands you might initialize the backend user object with :php:`\TYPO3\CMS\Core\Core\Bootstrap::initializeBackendUser()`.
+When working with CLI and commands you might initialize the backend user object with :php:`\TYPO3\CMS\Core\Core\Bootstrap::initializeBackendUser()`. In addition, you can call :php:`\TYPO3\CMS\Core\Core\Bootstrap::initializeBackendAuthentication()` to load the language of the CLI user set in the backend so that view helpers (like :php:`f:translate()`) used in the CLI resolve to the correct language.
 
 .. index:: Backend user; Access
 .. _be-user-check: