Add confirmation on all buttons that can not be undone

issue5258
review271141002

statement.xml

@@ -251,6 +251,7 @@ this repository contains the full copyright notices and license terms. -->
         <record model="ir.model.button" id="statement_post_button">
             <field name="name">post</field>
             <field name="string">Post</field>
+            <field name="confirm">Are you sure you want to post the statement?</field>
             <field name="model"
                 search="[('model', '=', 'account.statement')]"/>
         </record>