There's nothing exact about it, it's just wrong and very very confusing.
A currency is a unit, a scale-factor. It can only be translated if you also translate, i.e. re-compute, the corresponding measure (the number itself).
I would classify this a major bug, the reasonable thing if they don't want to fix it (since fixing it requires reaching out to a time-dependent currency conversion table, it might be a non-desirable thing to do) they should just not translate that part at all. Then it becomes up to the reader to go back and look up the currency in question, instead of just thinking it's already been done.
