Keep existing 'column-header' class while adding new 'col-<column_name>'...

Keep existing 'column-header' class while adding new 'col-<column_name>' classes to columns in list view.

flask_admin/templates/bootstrap3/admin/model/list.html

@@ -61,7 +61,7 @@
                     {% endblock %}
                     {% set column = 0 %}
                     {% for c, name in list_columns %}
-                    <th class="column-{{c}}">
+                    <th class="column-header col-{{c}}">
                         {% if admin_view.is_sortable(c) %}
                             {% if sort_column == column %}
                                 <a href="{{ sort_url(column, True) }}" title="{{ _gettext('Sort by %(name)s', name=name) }}">
@@ -120,7 +120,7 @@
                 </td>
                 {% endblock %}
                 {% for c, name in list_columns %}
-                    <td class="column-{{c}}">
+                    <td class="col-{{c}}">
                     {% if admin_view.is_editable(c) %}
                         {% if form.csrf_token %}
                         {{ form[c](pk=get_pk_value(row), value=get_value(row, c), csrf=form.csrf_token._value()) }}