update backend

config.xml
admin/helpers/sp_structur/soccer.xml
admin/language/de-DE/de-DE.com_sportsmanagement.ini
admin/views/jlxmlimports/tmpl/info.php
update language/de-DE/de-DE.com_sportsmanagement.ini
Merge pull request #53 from sigal/develop

update backend sprachvariablen