Fix wrong history table heading label

Resources/translations/SonataAdminBundle.en.xliff

@@ -302,6 +302,10 @@
                 <source>td_action</source>
                 <target>Action</target>
             </trans-unit>
+            <trans-unit id="td_compare">
+                <source>td_compare</source>
+                <target>Compare</target>
+            </trans-unit>
             <trans-unit id="td_revision">
                 <source>td_revision</source>
                 <target>Revisions</target>

Resources/translations/SonataAdminBundle.nl.xliff

@@ -302,6 +302,10 @@
                 <source>td_action</source>
                 <target>Handeling</target>
             </trans-unit>
+            <trans-unit id="td_compare">
+                <source>td_compare</source>
+                <target>Vergelijk</target>
+            </trans-unit>
             <trans-unit id="td_revision">
                 <source>td_revision</source>
                 <target>Revisies</target>

Resources/views/CRUD/base_history.html.twig

@@ -28,7 +28,7 @@ file that was distributed with this source code.
                     <th>{{ "td_timestamp"|trans({}, 'SonataAdminBundle') }}</th>
                     <th>{{ "td_username"|trans({}, 'SonataAdminBundle') }}</th>
                     <th>{{ "td_action"|trans({}, 'SonataAdminBundle') }}</th>
-                    <th>{{ "td_action"|trans({}, 'SonataAdminBundle') }}</th>
+                    <th>{{ "td_compare"|trans({}, 'SonataAdminBundle') }}</th>
                 </tr>
             </thead>
             <tbody>