Merge pull request #38 from Edugate/develop

convert federation_members relation to real Entity
Fix for the ability to translate into Czech

It's not possible to use web interface to translate JAGGER into Czech.
Only 'An Error Was Encountered' message is shown.
Merge branch 'develop' into 1.x-stable
Added partial Czech translation

Some texts are still not translated, yet. However, it's just a matter of
time.
Merge pull request #39 from JanOppolzer/1.x-stable

Czech translation