[FIX] website: put the name of the "edit in backend" button in the state

Since the button must be rendered when its text changes, the variable
that holds its text must be stored in the component state. The button
already had the right text before a bit by chance because the new name
was computed before the component was rendered. Now we make sure that
the component will be rendered when the name is recomputed. The problem
is visible if we slow down the getUserModelName function and go to a
forum.post from a forum.forum.

task-2889929

closes odoo/odoo#99599

Signed-off-by: Quentin Smetz (qsm) <qsm@odoo.com>