EXOGTN-1952: [Content Explorer] Wrong icons of Powerpoint (.ppt) and Excel (.xls) files in Admin/List views

Fix description:
* Define new classes for these file types.
EXOGTN-1952: [Content Explorer] Wrong icon of .ppt in Admin/List views - Add missing comma
SWF-3098 : Create open-doc-in-office branch and update projects versions
ECMS-6518: Open Document in Office. Implement add Open... button
ECMS-6518: Update OpenDocument js