GUACAMOLE-680: Display status message upon logout (rather than immediately reauthenticating).

The former behavior (immediately reauthenticating) typically results in
the login screen appearing, but will also instantly sign the user back
in if a single sign-on solution is being used. This results in the
logout action appearing to have no effect when SSO is involved.

guacamole/src/main/frontend/src/translations/en.json

@@ -15,6 +15,7 @@
         "ACTION_DELETE_SESSIONS"    : "Kill Sessions",
         "ACTION_DOWNLOAD"           : "Download",
         "ACTION_LOGIN"              : "Login",
+        "ACTION_LOGIN_AGAIN"        : "Re-login",
         "ACTION_LOGOUT"             : "Logout",
         "ACTION_MANAGE_CONNECTIONS" : "Connections",
         "ACTION_MANAGE_PREFERENCES" : "Preferences",
@@ -44,6 +45,7 @@
         "FORMAT_DATE_TIME_PRECISE" : "yyyy-MM-dd HH:mm:ss",
 
         "INFO_ACTIVE_USER_COUNT" : "Currently in use by {USERS} {USERS, plural, one{user} other{users}}.",
+        "INFO_LOGGED_OUT"        : "You have been logged out.",
 
         "TEXT_ANONYMOUS_USER"   : "Anonymous",
         "TEXT_HISTORY_DURATION" : "{VALUE} {UNIT, select, second{{VALUE, plural, one{second} other{seconds}}} minute{{VALUE, plural, one{minute} other{minutes}}} hour{{VALUE, plural, one{hour} other{hours}}} day{{VALUE, plural, one{day} other{days}}} other{}}",