[FIX] base, tools: use getlocale vs deprecated getdefaultlocale

As getdefaultlocale is deprecated in 3.11 in favor of getlocale which is
available since at least 3.0.

Part-of: odoo/odoo#112450

odoo/addons/base/models/res_lang.py

@@ -139,7 +139,7 @@ class Lang(models.Model):
             except locale.Error:
                 continue
         if fail:
-            lc = locale.getdefaultlocale()[0]
+            lc = locale.getlocale()[0]
             msg = 'Unable to get information for locale %s. Information from the default locale (%s) have been used.'
             _logger.warning(msg, lang, lc)
 

odoo/tools/translate.py

@@ -1412,7 +1412,7 @@ def trans_load_data(cr, fileobj, fileformat, lang, verbose=True, overwrite=False
 
 def get_locales(lang=None):
     if lang is None:
-        lang = locale.getdefaultlocale()[0]
+        lang = locale.getlocale()[0]
 
     if os.name == 'nt':
         lang = _LOCALE2WIN32.get(lang, lang)