update frontend

update site/language/de-DE/de-DE.com_sportsmanagement.ini
update site/language/en-GB/en-GB.com_sportsmanagement.ini
update site/views/clubplan/tmpl/default_matches_sorted_by_date.php

Signed-off-by: stony <webmaster@sport4u.at>
Merge pull request #137 from sigal/develop

update frontend