[FIX] Fixed ci style & tutorial issues

Author: youness benbraitit (yoben)

estate/models/estate_property.py

@@ -1,6 +1,6 @@
 from datetime import date
 from dateutil.relativedelta import relativedelta
-from odoo.exceptions import UserError, ValidationError
+from odoo.exceptions import UserError
 from odoo import api, fields, models
 
 

estate/views/estate_property_offer_views.xml

@@ -23,9 +23,9 @@
                 <field name="state"/>
                 <field name="validity"/>
                 <field name="date_deadline"/>
-                <button name="action_accept" type="object" icon="fa-check" help="Accept"
+                <button name="action_accept" type="object" icon="fa-check" title="Accept"
                     />
-                <button name="action_refuse" type="object" icon="fa-times" help="Refuse"
+                <button name="action_refuse" type="object" icon="fa-times" title="Accept"
                     />
             </list>
         </field>