Updated strings and added a bit of styling (#692)

config/locales/en.yml

@@ -151,8 +151,8 @@ en:
       confirmation: doesn't match %{attribute}
       inclusion: is not included in the list
     no_provider:
-      message: The customer you provided doesn't have Greenlight configured
-      help: Please contact Blindside Networks to setup Greenlight
+      message: The site you are trying to access is not enabled
+      help: Please contact your system administrator to setup Greenlight
     not_found:
       message: Sorry! The page you are looking for does not exist.
       help: Is it possible its been removed?
@@ -384,7 +384,7 @@ en:
     invite_participants: Invite Participants
     join: Join
     last_session: Last session on %{session}
-    login: Login
+    login: Enter
     owner: Owner
     no_sessions: This room has no sessions, yet!
     recordings: Room Recordings