[FIX] core: allow uppercase characters in translatable fields

Identifiers (including column names) that are not double-quoted are folded to
lowercase in PostgreSQL. Before this commit, this resulted in errors when
updating translations for translatable fields, because the query did not
correctly quote all identifiers.

opw-3287428

closes odoo/odoo#124500

Signed-off-by: Julien Castiaux (juc) <juc@odoo.com>