Register all buttons are registered in ir.model.button

issue6389
review36621002

production.xml

@@ -25,5 +25,11 @@ this repository contains the full copyright notices and license terms. -->
             <field name="type">form</field>
             <field name="name">split_start_form</field>
         </record>
+        <record model="ir.model.button" id="production_split_wizard_button">
+            <field name="name">split_wizard</field>
+            <field name="string">Split</field>
+            <field name="model"
+                search="[('model', '=', 'production')]"/>
+        </record>
     </data>
 </tryton>

view/production_form.xml

@@ -5,6 +5,6 @@ this repository contains the full copyright notices and license terms. -->
     <xpath
         expr="/form/group[@id='state_buttons']/group[@id='buttons']/button[@name='draft']"
         position="after">
-        <button name="split_wizard" string="Split" icon="tryton-production-split"/>
+        <button name="split_wizard" icon="tryton-production-split"/>
     </xpath>
 </data>