[FIX] account_peppol: update phonenumbers error message

If phonenumbers library is not installed, we should display a
relevant error message, instead of the generic invalid phone number
error message.

closes odoo/odoo#154926

closes odoo/odoo#158546

Signed-off-by: Laurent Smet (las) <las@odoo.com>
Signed-off-by: Aliya Tastemirova (alta) <alta@odoo.com>

addons/account_peppol/i18n/account_peppol.pot

@@ -554,6 +554,13 @@ msgstr ""
 msgid "Please fill in the EAS code and the Participant ID code."
 msgstr ""
 
+#. module: account_peppol
+#. odoo-python
+#: code:addons/account_peppol/models/res_company.py:0
+#, python-format
+msgid "Please install the phonenumbers library."
+msgstr ""
+
 #. module: account_peppol
 #. odoo-python
 #: code:addons/account_peppol/wizard/account_move_send.py:0

addons/account_peppol/models/res_company.py

@@ -82,7 +82,7 @@ class ResCompany(models.Model):
             "Currently, only European countries are supported.")
 
         if not phonenumbers:
-            raise ValidationError(error_message)
+            raise ValidationError(_("Please install the phonenumbers library."))
 
         phone_number = phone_number or self.account_peppol_phone_number
         if not phone_number: