[FIX] base,l10n_gcc_invoice: apply the 'Total amount in letters' setting

Summary
-------
Currently, the 'Total amount of invoice in letters' setting doesn't do
anything on GCC invoices.

Steps to reproduce
------------------
* install `l10n_sa`
* enable the Arabic language
* in the settings, enable 'Total amount of invoice in letters'
* create and print an invoice

You should see that the amount in words in not displayed.

Note:
Currently, currency labels are not translatable. Since this isn't
something that can be changed in stable version, it was decided to not
include them in the Arabic amount in words.

opw-3501112
opw-3485691

closes odoo/odoo#146364

X-original-commit: 1fb28f229c701ae1261dc502ef345ffda162f994
Signed-off-by: de Wouters de Bouchout Jean-Benoît (jbw) <jbw@odoo.com>
Signed-off-by: Séna Serge Nshimiyimana (sesn) <sesn@odoo.com>

addons/l10n_gcc_invoice/models/account_move.py

@@ -1,9 +1,19 @@
 # -*- coding: utf-8 -*-
 # Part of Odoo. See LICENSE file for full copyright and licensing details.
 
+import logging
+
 from odoo import fields, models, api
 
 
+_logger = logging.getLogger(__name__)
+
+try:
+    from num2words import num2words
+except ImportError:
+    _logger.warning("The num2words python library is not installed, amount-to-text features won't be fully available.")
+    num2words = None
+
 class AccountMove(models.Model):
     _inherit = 'account.move'
 
@@ -15,6 +25,13 @@ class AccountMove(models.Model):
             return 'l10n_gcc_invoice.arabic_english_invoice'
         return super()._get_name_invoice_report()
 
+    def _num2words(self, number, lang):
+        if num2words is None:
+            _logger.warning("The library 'num2words' is missing, cannot render textual amounts.")
+            return ""
+
+        return num2words(number, lang=lang).title()
+
 
 class AccountMoveLine(models.Model):
     _inherit = 'account.move.line'

addons/l10n_gcc_invoice/views/report_invoice.xml

@@ -432,6 +432,17 @@
                     </div>
                 </div>
 
+                <div class="mb-2">
+                    <p class="lh-sm" t-if="o.company_id.display_invoice_amount_total_words">
+                        Total amount in words: <br/>
+                        <span class="text-muted" t-field="o.amount_total_words"/>
+                    </p>
+                    <p class="text-end lh-sm" t-if="o.company_id.display_invoice_amount_total_words">
+                        المبلغ الإجمالي <br/>
+                        <span class="text-muted" t-out="o._num2words(o.amount_total, 'ar_001')"/>
+                    </p>
+                </div>
+
                 <div t-if="o.currency_id != o.company_id.currency_id"
                      class="row clearfix ms-auto text-nowrap border-top border-bottom p-2">
                     <t t-set="exchange_rate"