do not hide "Cancel" and "Filter" text buttons (bug 817517)

mkt/templates/mkt/header.html

@@ -10,8 +10,8 @@
          class="header-button icon settings left" title="{{ _('Settings') }}"></a>
       <a href="#" id="nav-back" class="header-button icon back left" title="{{ _('Back') }}"><b></b></a>
       <a href="#" class="header-button icon search right" title="{{ _('Search') }}"></a>
-      <a href="#" class="header-button cancel right" title="{{ _('Cancel') }}"></a>
-      <a href="#" class="header-button filter right" title="{{ _('Filter') }}"></a>
+      <a href="#" class="header-button cancel right">{{ _('Cancel') }}</a>
+      <a href="#" class="header-button filter right">{{ _('Filter') }}</a>
       <a href="#" class="header-button icon expand right" title="{{ _('Expand') }}"></a>
       {% block search %}
         {% set data = {'cat': category.id} if category else request.GET %}