stock_transfer_order/views/stock_move.xml

<?xml version="1.0" encoding="utf-8"?>
<openerp>
  <data>
    <record id="stock_move_form" model="ir.ui.view">
      <field name="name">stock_move_form</field>
      <field name="model">stock.move</field>
      <field name="inherit_id" ref="stock.view_move_form"/>
      <field name="arch" type="xml">
        <button name="action_done"  position="replace">
          <button name="action_done_button" states="draft,assigned,confirmed" string="Procesar" type="object" class="oe_highlight"/>        
        </button>

      </field>
    </record>
  </data>
</openerp>