Remove string attribute from views

issue2350

view/asset_create_moves_start_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="Create Assets Moves" col="2">
+<form col="2">
     <image name="tryton-dialog-information" xexpand="0" xfill="0"/>
     <group col="3" id="label_date">
         <label string="Create Assets Moves up to" id="create"

view/asset_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="Asset" col="6">
+<form col="6">
     <label name="product"/>
     <field name="product"/>
     <label name="account_journal"/>

view/asset_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="Asset Line" col="6">
+<form col="6">
     <label name="asset"/>
     <field name="asset" colspan="5"/>
     <label name="date"/>

view/asset_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="Asset Lines">
+<tree>
     <field name="asset"/>
     <field name="date"/>
     <field name="actual_value" expand="1"/>

view/asset_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="Assets">
+<tree>
     <field name="number"/>
     <field name="product"/>
     <field name="start_date"/>

view/asset_update_show_depreciation_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="Asset Depreciation Move">
+<form>
     <label name="amount"/>
     <field name="amount"/>
     <label name="date"/>

view/asset_update_start_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="Update Asset">
+<form>
     <label name="value"/>
     <field name="value"/>
     <label name="residual_value"/>

view/print_depreciation_table_start.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="Choose Dates">
+<form>
     <label name="start_date"/>
     <field name="start_date"/>
     <label name="end_date"/>