Fix error message "foreign_model_exist"

The value argument has no meaning for this error message and the way it is
retreived in changeset dbbbe6cae2bb is buggy.

review3381002

trytond/ir/translation.xml

@@ -215,8 +215,8 @@ this repository contains the full copyright notices and license terms. -->
             <field name="name">foreign_model_exist</field>
             <field name="lang">en_US</field>
             <field name="type">error</field>
-            <field name="src">Could not delete "%(value)s" records because they are used on field "%(field)s" of "%(model)s".</field>
-            <field name="value">Could not delete "%(value)s" records because they are used on field "%(field)s" of "%(model)s".</field>
+            <field name="src">Could not delete the records because they are used on field "%(field)s" of "%(model)s".</field>
+            <field name="value">Could not delete the records because they are used on field "%(field)s" of "%(model)s".</field>
             <field name="module">ir</field>
             <field name="fuzzy" eval="False"/>
         </record>

trytond/model/modelsql.py

@@ -847,7 +847,6 @@ class ModelSQL(ModelStorage):
                                 (field_name, 'in', sub_ids),
                                 ], order=[]):
                         error_args = Model._get_error_args(field_name)
-                        error_args['value'] = cls._get_error_args('id')[1]
                         cls.raise_user_error('foreign_model_exist',
                             error_args=error_args)