Merge pull request #797 from supriyasawant/mongokit

bug resolved in theme tree display.
Bug resolved: While saving sub-types of Courses (NUSSD Course) & (Announced Course)
Merge branch 'mongokit' of https://github.com/gnowledge/gstudio into mongokit
Merge pull request #798 from AvadootNachankar/mongokit

Bug resolved - While saving sub-types of Courses (NUSSD Course) & (Announced Course)
get_preferred_lang logic redefined
Merge branch 'mongokit' of https://github.com/gnowledge/gstudio into mongokit