[FIX] account: Fix error message for registering payment invoice and bill at the same time

When registering payment for customer invoices and vendor bills at the same time, a misleading error message appears"You can't register payments for journal eithers being both inbound and outbound".

Replacing it with a clear message "You can't register payments for both inbound and outbound moves at the same time."

Task id: 3638740

closes odoo/odoo#162464

X-original-commit: a18cb2ebb133c2e4b72ddd5d8cda23d2b71006dd
Signed-off-by: de Wouters de Bouchout Jean-Benoît (jbw) <jbw@odoo.com>
Signed-off-by: Seif Gneedy (segn) <segn@odoo.com>

addons/account/i18n/account.pot

@@ -15865,8 +15865,8 @@ msgstr ""
 #: code:addons/account/wizard/account_payment_register.py:0
 #, python-format
 msgid ""
-"You can't register payments for journal items being either all inbound, "
-"either all outbound."
+"You can't register payments for both inbound and outbound moves "
+"at the same time."
 msgstr ""
 
 #. module: account

addons/account/wizard/account_payment_register.py

@@ -668,7 +668,7 @@ class AccountPaymentRegister(models.TransientModel):
             if len(lines.company_id.root_id) > 1:
                 raise UserError(_("You can't create payments for entries belonging to different companies."))
             if len(set(available_lines.mapped('account_type'))) > 1:
-                raise UserError(_("You can't register payments for journal items being either all inbound, either all outbound."))
+                raise UserError(_("You can't register payments for both inbound and outbound moves at the same time."))
 
             res['line_ids'] = [(6, 0, available_lines.ids)]