performance warning: text cleanup

src/index.html

@@ -74,7 +74,7 @@
   <span class="cheatsheet-link icon-common-keyboard-gold"
         rel="tooltip" data-placement="right" title="Keyboard shortcuts">&nbsp;</span>
   <div class="performance-link icon-common-warning-red"
-       rel="tooltip" data-placement="left" title="Performance issues: learn more.">&nbsp;</div>
+       rel="tooltip" data-placement="left" title="Performance problem detected, learn more.">&nbsp;</div>
 
   <!-- dialogs partials -->
   @@include('templates/dialogs/create-palette.html', {})

src/js/controller/UserWarningController.js

@@ -44,7 +44,7 @@
     // and we were not displaying a warning before.
     if (shouldDisplayWarning && !isWarningDisplayed) {
       $.publish(Events.SHOW_NOTIFICATION, [{
-        'content': 'performance problem notification ' +
+        'content': 'Performance problem detected, ' +
                    '<a href="#" style="color:red;"' +
                        'onclick="pskl.controller.UserWarningController.showPerformanceInfoDialog()">' +
                       'learn more?</a>',