[WebProfilerBundle] Specify missing alt attributes

src/Symfony/Bundle/WebProfilerBundle/Resources/views/Collector/events.html.twig

@@ -2,7 +2,7 @@
 
 {% block menu %}
 <span class="label">
-    <span class="icon"><img src="{{ asset('bundles/webprofiler/images/profiler/events.png') }}" alt="" /></span>
+    <span class="icon"><img src="{{ asset('bundles/webprofiler/images/profiler/events.png') }}" alt="Events" /></span>
     <strong>Events</strong>
 </span>
 {% endblock %}

src/Symfony/Bundle/WebProfilerBundle/Resources/views/Collector/exception.html.twig

@@ -7,7 +7,7 @@
 
 {% block menu %}
 <span class="label">
-    <span class="icon"><img src="{{ asset('bundles/webprofiler/images/profiler/exception.png') }}" alt="" /></span>
+    <span class="icon"><img src="{{ asset('bundles/webprofiler/images/profiler/exception.png') }}" alt="Exception" /></span>
     <strong>Exception</strong>
     <span class="count">
         {% if collector.hasexception %}

src/Symfony/Bundle/WebProfilerBundle/Resources/views/Collector/logger.html.twig

@@ -12,7 +12,7 @@
 
 {% block menu %}
 <span class="label">
-    <span class="icon"><img src="{{ asset('bundles/webprofiler/images/profiler/logger.png') }}" alt="" /></span>
+    <span class="icon"><img src="{{ asset('bundles/webprofiler/images/profiler/logger.png') }}" alt="Logger" /></span>
     <strong>Logs</strong>
     {% if collector.counterrors %}
         <span class="count">

src/Symfony/Bundle/WebProfilerBundle/Resources/views/Collector/request.html.twig

@@ -18,7 +18,7 @@
 
 {% block menu %}
 <span class="label">
-    <span class="icon"><img src="{{ asset('bundles/webprofiler/images/profiler/request.png') }}" alt="" /></span>
+    <span class="icon"><img src="{{ asset('bundles/webprofiler/images/profiler/request.png') }}" alt="Request" /></span>
     <strong>Request</strong>
 </span>
 {% endblock %}