translation : adding context to be able to translate «order» the good way

Hello,
here is a request to be able to translate the word «order» without overriding the already mezzanine translated «order» (as in _numerical order_) in languages where this is two different word.
I did import `pgettext_lazy` as `__` to mimic the `ugettext as _`, I don't know if it's a good idea.
Anyway, here it is, with the corrected `.po` file.

cheers,
Luc