Before this commit, the session object was responsible for loading the
translations in the backend only. There was then ugly code in web_editor
(which is also loaded in backend...) which was doing "if frontend then
load translations by myself". This code was also translating templates
while this is the qweb object's job. Now session is always responsible
for loading translation.
Note: the session object should be refactored/split.
qsm-odoo
16f0e50318