Support adding and deleting comments (database, glossary, blogs, etc..)

Test on one device of your choice. Login in the master mobile site (3.7+) with MDL-64588 integrated. Navigate to an area with comments (ensure you can add comments on it using website). Glossary, Database and blogs have comments). Click on comments so you see the list of them (or none). Check add button appears at the bottom right of the screen. Add a comment, save. Check it sends and the list displays the new comment. Delete the comment. Check it's correctly deleted. Now try go offline and add another comment. Check it's added but not sended. Restore it before going online. Go online, sync and check the comment not deleted. Go offline again and delete it. Go online and check it syncs when online after a while or manually. Check it's deleted forever.