Add (optional) support for "localizing" numbers

[jopdeklein]

In our applications we deal with multiple currencies, some of which end up longer than our base currency (for example, €100 vs RUB7 554). It would be useful if we can augment particular "numbers" such as currencies in the DOM, to be extended by x characters, in order to simulate currencies that use longer currency codes, or are "inflated" in relation to the base currency used in your project.

[jopdeklein]

WIP approach can be found here:
FindHotel#1

Any preliminary feedback is appreciated.

[jopdeklein]

I played around with this and while it works, the need arose to be able to white/black list not only on element / tag level, but some form of opt in / out method on element level in order to pseudo localize (or not) particular elements.

In our case currencies benefit from pseudo localization, but most numbers such as the day part of a date end up breaking our UI unnecessarily.

I was thinking of adding support data-pseudolocalize attributes to control the localization of a particular subtree, if I get around to it I'll open another PR.