fixing translation: column intestations weren't translated

svn path=/trunk/; revision=24503

donate/donate.it.xhtml

@@ -46,11 +46,11 @@
       <fieldset>
         <table>
           <tr>
-            <th>Level (until 2012)</th>
-            <th>Monthly donation</th>
-            <th>Yearly donation</th>
-            <th>One-time donation</th>
-            <th>Level (from 2013 on)</th>
+            <th>Livello (fino al 2012)</th>
+            <th>Donazione mensile</th>
+            <th>Donazione annuale</th>
+            <th>Donazione singola</th>
+            <th>Livello (A partire dal 2013)</th>
           </tr>
           <tr>
             <td rowspan="2"><a