Merge pull request #216 from react-epfl/fix215/itemUrl

Adapts the itemUrl to the info coming from Graasp. Closes #215
Implement Time spent in ILS phases gadget. Closes #202
Merge pull request #219 from react-epfl/feat218/ilsInternationalization

Metawidget internationalization.
Update app.js

Provides the url for running the metawidget locally and in production
Merge pull request #217 from react-epfl/feat202/timeSpentInILSPhases

Gadget for the time spent in ILS phases
Update app.js

Allows the visualization of http and https URLs
Fixing sockets and cleaning
Merge pull request #224 from react-epfl/feat202/timeSpentInILSPhases

Fixing sockets and cleaning.
Dutch, ukranian and russian translations for the metawidget.