Clarify stats wording

src/Packagist/WebBundle/Resources/views/Web/stats.html.twig

@@ -8,8 +8,8 @@
         <p><img src="http://chart.apis.google.com/chart?chxr=0,0,{{ versions }}&amp;chxl=1:|{{ chart.months|join('|') }}&amp;chxt=y,x&amp;chs=900x250&amp;chds=0,{{ versions }},0,{{ versions }}&amp;cht=lc&amp;chco=0000FF,FF9900&amp;chd=t:{{ chart.versions|join(',') }}|{{ chart.packages|join(',') }}&amp;chdl=Versions|Packages&amp;chls=2|2" /></p>
 
         <h2>Totals</h2>
-        <p>{{ packages|number_format(0, '.', " ") }} packages</p>
-        <p>{{ versions|number_format(0, '.', " ") }} versions</p>
-        <p>{{ downloads == 'N/A' ? downloads : downloads|number_format(0, '.', " ") }} packages installed since 2012-04-13</p>
+        <p>{{ packages|number_format(0, '.', " ") }} packages registered</p>
+        <p>{{ versions|number_format(0, '.', " ") }} versions available</p>
+        <p>{{ downloads == 'N/A' ? downloads : downloads|number_format(0, '.', " ") }} packages installed (since 2012-04-13)</p>
     </div>
 {% endblock %}