[IMP] add class to default custom filters so they can be styled specifically
[IMP] add class to default custom filters so they can be styled specifically

akretion/openerp-web,havt/openerp-web,havt/openerp-web,havt/openerp-web,akretion/openerp-web,akretion/openerp-web,havt/openerp-web,havt/openerp-web