Bug resolved: For Newly created SystemTypes, modified_by and contributors values were not saving


**Functionalities implemented:**

1) Now appropriate values get saved in modified_by and contributors fields for newly created SystemTypes

    - Files modified:
       1) views/adminDesignerDashboard.py

2) Bug resolved: Page-names with unicode values were giving error

    - Files modified:
       1) views/page.py
       2) views/ajax_views.py
       3) views/methods.py

3) 'Read video' tab-label renamed to 'Read'

    - Files modified:
       1) templates/ndf/node_ajax_view.html