Merge pull request #338 from deniszgonjanin/master

Fix for GCOD-681
Add a Application resource type and change the package template
Added code to conceal Related Items if there are not App resources
Merge pull request #339 from thriuin/master

Add a Application resource type and change the package template
Minor changes to formatting for the time period coverage field.
Add default preview image for geospatial datasets
Add explicit sorting to the SQL query. Temporary fix until SQLAlchemy changes go in.
Small typo fix.
Merge pull request #340 from thriuin/master

More minor changes for linking apps and some bug fixes
Add subjects to the package page, bolded titles, and updated null value labels for the temporal coverage field.
Merge pull request #341 from thriuin/master

Add subjects to the package page, bolded titles, and updated null value ...
test for unwanted unpublishing behaviour
fix portal release date test
fix unpublish bug
Merge pull request #342 from wardi/unpublish-bug

Fix for normal users unpublishing datasets when editing them
update resource added FR
Merge pull request #343 from wardi/master

update "resource added" flash message fra translation
Template fix for datasets with apps
Merge pull request #344 from thriuin/master

Template fix to handle variable scope in Jinja2 for datasets with apps.
Add more French translations for DS history page