1. Spliting strings inside the call to `gettext()` in javascript breaks the string extraction process, so the string should kept in one line.
2. Using escape string inside a string in `gettext()` may cause the extractor to misunderstand the escape string, so that it will escape this escape string.
These changes implement STUD-813. The commit consists of the
following logical changes:
- a REST API has been implemented for a course's assets
- the page itself now fetches the assets client-side
- the Backbone.Paginator library is used to support pagination
- the AssetCollection has been refactored to extend
Backbone.Paginator.requestPager so that it can be paged
- an abstract PagingView class has been added to generalize
the communication with a paging REST API
- the AssetsView has been reimplemented to extend PagingView
- two new child views have been added:
- PagingHeader: the paging controls above the list of assets
- PagingFooter: the paging controls below the assets