modules/admin_system: Add note to step2 of firmware flashing telling the user if configuration is kept or not, thanks hnyman (#298)

modules/admin-full/luasrc/view/admin_system/upgrade.htm

@@ -78,6 +78,11 @@ $Id$
 					))
 				end
 			%></li>
+			<li><% if keepconfig then %>
+				<%:Configuration files will be kept.%>
+			<% else %>
+				<%:Note: Configuration files will be erased.%>
+			<% end %></li>
 		</ul>
 	</p>
 	<div class="cbi-page-actions right">