'attribute_set' & 'relation_set' fields added under GSystem class.
Script updated to add 'attribute_set' & 'relation_set' fields with default values (as []) in all existing GSystem documents.
Merge branch 'mongokit' of https://github.com/gnowledge/gstudio into mongokit
Merge pull request #805 from AvadootNachankar/mongokit

Changes in models.py (GSystem class)
trans block syntax & invalid django variables rectified.
trans block syntax & invalid django variables rectified.
Bug resolved: Student's details page redirection from list-view page
Merge pull request #806 from AvadootNachankar/mongokit

Bugs resolved - trans block syntax & invalid django variables rectified; Student-details page redirection
Merge pull request #807 from anujag/mongokit

forum url modified
po files updated
Merge pull request #808 from supriyasawant/mongokit

po files updated
check userpreference modified