Allow recordings to be 'unlisted'

Unlisted is a state between published and unpublished. They are still
published in the server, but will not appear to anyone other than the
user that created the recording.
It is done using a metadata attribute and required several changes in how
the application handles publishing and unpublishing.

config/locales/en-us.yml

@@ -38,6 +38,8 @@
 en-US:
   actions: Actions
   are_you: Are you %{name}?
+  are_you_sure: Are you sure?
+  change_recording_visibility: "Change visibility to:"
   client:
     are_you_sure: Are you sure?
     delete_recording: Delete recording
@@ -48,6 +50,7 @@ en-US:
     publish_recording: Publish recording
     recording_deleted: Recording was deleted
     recording_published: Recording was published
+    recording_unlisted: Recording was unlisted
     recording_unpublished: Recording was unpublished
     unpublish_recording: Hide recording
   copied: Copied
@@ -61,6 +64,7 @@ en-US:
   greet_user: Welcome, %{name}
   greet_guest: Welcome to %{name} Meeting Space
   hi_all: Hi Everyone
+  innaccessible: Innaccessible
   join: Join
   join_session: Join the current session
   join_session_id: Join %{id}
@@ -82,11 +86,13 @@ en-US:
   footer_html: "%{greenlight_link} build %{version}, Powered by %{bbb_link}"
   presentation: Presentation
   previously_joined_meetings: Previously Joined Sessions
+  published: Published
   return_to_room: Return to your personal room
   session_url_explanation: The session will be taking place using the following URL
   start: Start
   your_personal_room: Your Personal Room
   thumbnails: Thumbnails
+  unlisted: Unlisted
   url_copy_explanation: Copy this URL to invite others to the meeting
   url_refresh_hint: Generate a new meeting URL
   video: Video