Remove string attribute from views

issue2350

view/opportunity_employee_context_form.xml

@@ -1,7 +1,7 @@
 <?xml version="1.0"?>
 <!-- This file is part of Tryton.  The COPYRIGHT file at the top level of
 this repository contains the full copyright notices and license terms. -->
-<form string="Sale Opportunities per Employee Context">
+<form>
     <label name="start_date"/>
     <field name="start_date"/>
     <label name="end_date"/>

view/opportunity_employee_graph1.xml

@@ -1,7 +1,7 @@
 <?xml version="1.0"?>
 <!-- This file is part of Tryton.  The COPYRIGHT file at the top level of
 this repository contains the full copyright notices and license terms. -->
-<graph string="Opportunities per Employee">
+<graph>
     <x>
         <field name="employee"/>
     </x>

view/opportunity_employee_graph2.xml

@@ -1,7 +1,7 @@
 <?xml version="1.0"?>
 <!-- This file is part of Tryton.  The COPYRIGHT file at the top level of
 this repository contains the full copyright notices and license terms. -->
-<graph string="Opportunities per Employee">
+<graph>
     <x>
         <field name="employee"/>
     </x>

view/opportunity_employee_monthly_tree.xml

@@ -1,7 +1,7 @@
 <?xml version="1.0"?>
 <!-- This file is part of Tryton.  The COPYRIGHT file at the top level of
 this repository contains the full copyright notices and license terms. -->
-<tree string="Sale Opportunities per Month">
+<tree>
     <field name="year"/>
     <field name="month"/>
     <field name="employee"/>

view/opportunity_employee_tree.xml

@@ -1,7 +1,7 @@
 <?xml version="1.0"?>
 <!-- This file is part of Tryton.  The COPYRIGHT file at the top level of
 this repository contains the full copyright notices and license terms. -->
-<tree string="Opportunities per Employee">
+<tree>
     <field name="employee"/>
     <field name="number"/>
     <field name="converted"/>

view/opportunity_form.xml

@@ -1,7 +1,7 @@
 <?xml version="1.0"?>
 <!-- This file is part of Tryton.  The COPYRIGHT file at the top level of
 this repository contains the full copyright notices and license terms. -->
-<form string="Sale Lead/Opportunity" cursor="party">
+<form cursor="party">
     <label name="reference"/>
     <field name="reference"/>
     <label name="number"/>

view/opportunity_line_form.xml

@@ -1,7 +1,7 @@
 <?xml version="1.0"?>
 <!-- This file is part of Tryton.  The COPYRIGHT file at the top level of
 this repository contains the full copyright notices and license terms. -->
-<form string="Sale Lead/Opportunity Line">
+<form>
     <label name="opportunity"/>
     <field name="opportunity" colspan="3"/>
     <label name="product"/>

view/opportunity_line_tree.xml

@@ -1,7 +1,7 @@
 <?xml version="1.0"?>
 <!-- This file is part of Tryton.  The COPYRIGHT file at the top level of
 this repository contains the full copyright notices and license terms. -->
-<tree string="Sales Leads/Opportunities Lines" sequence="sequence">
+<tree sequence="sequence">
     <field name="opportunity"/>
     <field name="product"/>
     <field name="quantity"/>

view/opportunity_monthly_graph1.xml

@@ -1,7 +1,7 @@
 <?xml version="1.0"?>
 <!-- This file is part of Tryton.  The COPYRIGHT file at the top level of
 this repository contains the full copyright notices and license terms. -->
-<graph string="Sale Opportunities per Month">
+<graph>
     <x>
         <field name="year_month"/>
     </x>

view/opportunity_monthly_graph2.xml

@@ -1,7 +1,7 @@
 <?xml version="1.0"?>
 <!-- This file is part of Tryton.  The COPYRIGHT file at the top level of
 this repository contains the full copyright notices and license terms. -->
-<graph string="Sale Opportunities per Month">
+<graph>
     <x>
         <field name="year_month"/>
     </x>

view/opportunity_monthly_tree.xml

@@ -1,7 +1,7 @@
 <?xml version="1.0"?>
 <!-- This file is part of Tryton.  The COPYRIGHT file at the top level of
 this repository contains the full copyright notices and license terms. -->
-<tree string="Sale Opportunities per Month">
+<tree>
     <field name="year"/>
     <field name="month"/>
     <field name="number"/>

view/opportunity_tree.xml

@@ -1,7 +1,7 @@
 <?xml version="1.0"?>
 <!-- This file is part of Tryton.  The COPYRIGHT file at the top level of
 this repository contains the full copyright notices and license terms. -->
-<tree string="Sales Leads/Opportunities">
+<tree>
     <field name="number"/>
     <field name="reference"/>
     <field name="start_date"/>