[FIX]point_of_sale: Mode of payment displayed browse_record object instead of the name of the method payment
[FIX] base_action_rule: attempt to reuse creator language when evaluating action filters

Some filters needs to be evaluated with the same
language as their author, e.g. when searching on
translatable field values. When a time-based
action is processed by the scheduled task,
we should thus attempt to reuse the same
language as the author of the corresponding
filter.
[FIX] point_of_sale: sales summary report displays actual amount of taxes, instead of displaying the amount where the taxe is applied