using on-screen labels for organizations, sites and external networks in filter dropdown boxes
fixed variable name
Merge pull request #541 from t-gerhard/fixes_orgadescr

using on-screen labels for organizations, sites and external networks in...
login button now redirects to current page after login
Reduced caching for host list as that contains dynamic data
removed a debug output
Merge pull request #542 from t-gerhard/login_button

login button now redirects to current page after login
Merge pull request #544 from dswd/fix-caching

Reduced caching for host list as that contains dynamic data