As an editor, I can quickly copy and paste the full file name (with suffix), so that I can use that file in an article without extra clicks.
== Acceptance Criteria
 The complete filename (with extension) is shown at the metadata panel just below the license.
 The user should be able to select and copy the text.
 (Optional) We may consider select the whole text when clicking or double clicking since the default behaviour may leave the extension unselected. Marked as optional since we need to be cautious when overriding default behaviours.
Note: this is a frequent user request on Media Viewer and RfC talk pages, which could help address editor concerns that this tool is interfering with their workflows.
Th file icon is available [[ https://dl.dropboxusercontent.com/u/30377416/prototypes/multimedia/file.svg | here ]].