outsource check for open support-tickets to init.php so that themes may display the info wherever they want

Signed-off-by: Michael Kaufmann (d00p) <d00p@froxlor.org>
fix undefined language indeces (add english as fallback as intented in case a string is not defined in the used language)

Signed-off-by: Michael Kaufmann (d00p) <d00p@froxlor.org>