In case of exception of type KeyError during the formatting with Babel instead to raise a Traceback, we first retry with the en_US locale. Babel fixes each week new bug of formatting like the one in the test, but we cannot bump our default babel version since it is not in the stable Ubuntu 22 so it is a best effort fix that will not hide all bugs but is better that nothing. https://github.com/python-babel/babel/pull/827 closes odoo/odoo#155909 Signed-off-by: Martin Trigaux (mat) <mat@odoo.com>