Change EditEntity status failure from session-failure to sessionfailure

There is no message for "session-failure"; instead it is "sessionfailure".

If wrong, it displays <session-failure> in the error bubble in the UI.

Change-Id: I18c9e54ffb48f841461c76b4ec4bc845b9c2dc33
Merge "Change EditEntity status failure from session-failure to sessionfailure"