[FIX] *: remove en_US as fallback for lang code

en_US may not be activated as it is possible to create a database in
another language using the database manager.

When trying to install a chart of account, the tax return entry tried
to format a date at the installation of the module, with no lang in
the context. The fallback was made on en_US but an error is raised if
that language is not activated.

As it is a very common scenario to retrieve a language from the
context, add a generic tool method to do it.

Replace and closes odoo/odoo#37629

closes odoo/odoo#37568

Signed-off-by: Martin Trigaux (mat) <mat@odoo.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/addons/website_event/controllers/main.py b/addons/website_event/controllers/main.py
index 1476c02da8a..20031a67781 100644
--- a/addons/website_event/controllers/main.py
+++ b/addons/website_event/controllers/main.py
@@ -12,6 +12,7 @@ from odoo import fields, http, _
 from odoo.addons.http_routing.models.ir_http import slug
 from odoo.addons.website.controllers.main import QueryURL
 from odoo.http import request
+from odoo.tools.misc import get_lang
 
 
 class WebsiteEventController(http.Controller):
@@ -229,7 +230,7 @@ class WebsiteEventController(http.Controller):
     def get_formated_date(self, event):
         start_date = fields.Datetime.from_string(event.date_begin).date()
         end_date = fields.Datetime.from_string(event.date_end).date()
-        month = babel.dates.get_month_names('abbreviated', locale=event.env.context.get('lang') or 'en_US')[start_date.month]
+        month = babel.dates.get_month_names('abbreviated', locale=get_lang(event.env).code)[start_date.month]
         return ('%s %s%s') % (month, start_date.strftime("%e"), (end_date != start_date and ("-" + end_date.strftime("%e")) or ""))
 
     @http.route('/event/get_country_event_list', type='json', auth='public', website=True)