diff --git a/invoice.xml b/invoice.xml
index 9d2db5bd14..b441db550a 100644
--- a/invoice.xml
+++ b/invoice.xml
@@ -212,12 +212,12 @@
                                 <label colspan="2"/>
                                 <label name="untaxed_amount"/>
                                 <field name="untaxed_amount"/>
-                                <button name="button_reset_taxes" string="Reset Taxes"
+                                <button name="button_reset_taxes" string="_Reset Taxes"
                                     type="object" colspan="2"
                                     states="{'readonly': '''state in ('open', 'paid')'''}"/>
                                 <label name="tax_amount"/>
                                 <field name="tax_amount"/>
-                                <button name="button_compute" string="Compute"
+                                <button name="button_compute" string="_Compute"
                                     type="object" colspan="2"
                                     states="{'readonly': '''state in ('open', 'paid')'''}"/>
                                 <label name="total_amount"/>
@@ -227,18 +227,18 @@
                                 <label name="state"/>
                                 <field name="state"/>
                                 <group col="5" colspan="4">
-                                    <button name="proforma" string="Pro Forma"
+                                    <button name="proforma" string="Pro For_ma"
                                         states="{'invisible': '''state != 'draft' '''}"/>
-                                    <button name="draft" string="Draft"
+                                    <button name="draft" string="_Draft"
                                         states="{'invisible': '''state != 'proforma' '''}"/>
-                                    <button name="open" string="Open"
+                                    <button name="open" string="_Open"
                                         states="{'invisible': '''state not in ('draft', 'proforma') ''', 'readonly': ''' %(account.group_account)d not in groups '''}"/>
-                                    <button name="cancel" string="Cancel"
+                                    <button name="cancel" string="_Cancel"
                                         states="{'invisible': '''state not in ('draft', 'proforma') ''', 'readonly': ''' %(account.group_account)d not in groups '''}"/>
-                                    <button name="button_draft" string="Reset to Draft"
+                                    <button name="button_draft" string="_Reset to Draft"
                                         type="object"
                                         states="{'invisible': '''state != 'cancel' '''}"/>
-                                    <button name="%(wizard_pay_invoice)d" string="Pay"
+                                    <button name="%(wizard_pay_invoice)d" string="_Pay"
                                         type="action"
                                         states="{'invisible': '''state != 'open' ''', 'readonly': ''' %(account.group_account)d not in groups '''}"/>
                                 </group>