TYPO3 Core

Hey,

the login page is not translatable. The labels are hardcoded and taken from the TYPO3_CONF_VARS['BE']['loginLabels']. However, through modifications in init.php, the $LANG object is now available on the login screen as well.

The attached patch does the following:

• Browser detection of the language (HTTP_ACCEPT_LANGUAGE) and sets it, if no user is logged in.
• Extracts all labels into a new locallang_login.xml file. There are some additional labels not in use right now because there are some modifications that will come in a separate patch.
• Has a backwards-compatible option to check if the $TYPO3_CONF_VARS['BE']['loginLabels'] was changed for the installation. If so, it overrides the LLvalues from the config option.
• Some labels were moved to a later stage of substituteMarkerArray so they can be used in other parts of the template as well (not just in the form subpart).
• Some minor code cleanup.

(issue imported from #M11293)