Adds an option for a hint message shown only to guests.

close.js

-/* global interfaceConfig */
+/* global interfaceConfig, getConfigParamsFromUrl */
 //list of tips
 var hints = [
     "You can pin participants by clicking on their thumbnails.",// jshint ignore:line
     var el = document.getElementById(id);
 
     if (el)
-        el.innerText = msg;
+        el.innerHTML = msg;
 }
 
 /**
     //Works only for close2.html because close.html doesn't have this element.
     insertTextMsg('thanksMessage',
         'Thank you for using ' + interfaceConfig.APP_NAME);
+
+    // If there is a setting show a special message only for the guests
+    if (interfaceConfig.CLOSE_PAGE_GUEST_HINT) {
+        let params = getConfigParamsFromUrl('search');
+        if ( params.guest ) {
+            var element = document.getElementById('hintQuestion');
+            element.classList.add('hide');
+            insertTextMsg('hintMessage', interfaceConfig.CLOSE_PAGE_GUEST_HINT);
+            return;
+        }
+    }
+
     insertTextMsg('hintMessage', getHint());
 }
 

interface_config.js

      * Whether to only show the filmstrip (and hide the toolbar).
      */
     filmStripOnly: false,
+    //A html text to be shown to guests on the close page, false disables it
+    CLOSE_PAGE_GUEST_HINT: false,
     RANDOM_AVATAR_URL_PREFIX: false,
     RANDOM_AVATAR_URL_SUFFIX: false,
     FILM_STRIP_MAX_HEIGHT: 120,