Added username autocomplete functionality
Wrong name for language variable.
https://tims.bastelstu.be/forum/index.php/Thread/283-Betatest-Fehlende-Sprachvariable/
Added missing header element for proper design.
https://tims.bastelstu.be/forum/index.php/Thread/304-Template-fehlerhaft/
Potential indentation improvement.
Merge pull request #46 from KRens/master

Added username autocomplete functionality + corrected language variable