Updated translations from transifex.
Do not execute anything if we are on the index page because no User is logged in
adjust Environment call to be compatible with contao 2.11
added mandatory info to list
Merge pull request #564 from Zeromax/feature-show-mandatory

adds mandatory info to backend list.
Merge pull request #545 from Zeromax/fix-initilaize

Do not perform any action when URL is backend index.php.
Merge branch 'dev' into contao3
Merge branch 'contao3' into tng
Fix some notices.
Add method getDispatcher() to centralize the event-dispatcher retrieval.
Load language files.
Code style.
Require bit3/contao-meta-palettes ~1.7
Merge pull request #573 from tristanlins/patch-2

Require bit3/contao-meta-palettes ~1.7
Fix file headers.
Switch to new code style.
Change tab to space indention.
Reformat dca files.
Reformat code.
Drop obsolete classes.