change color of console debug message

otherwise it is badly readable in Safari

client/jsFiles/SEAWebClientCommunication.js

@@ -313,7 +313,7 @@ function reqJSON(s, url, successHandler, errorHandler) {
             : new ActiveXObject('Microsoft.XMLHTTP');
     if (debugCommunication) {
         console.log("%cto server (reqJSON): %s",
-                "color:white;background:darkgreen", url);
+                "background:yellow", url);
     }
     xhr.open('get', url, true);
     xhr.onreadystatechange = function() {