I18n Module for Node and Express.js

1) Plurals

2) Productisation:

If you go into a different country, and you have give you product a different name, you would want to support that new name in all locales.

For example, if in the UK your product is called A and in Germany it's called B. Then when you visit the UK site in the German locale, it should call the product "A"

3) Currency formatting

If you are a US user, who visits a page which is showing Canadian prices, you'll want it to say something like CAD$10.

Different Eurozone countries have different ways of displaying currency (€10/10€)

4) Distance formatting

5) Time and Date formatting

4) An i18n strategy for images

5) This gets more into localisation rather than i18n, but localising images can be difficult (if you have a car, then you would want the correct number plate or you'd want the steering wheel to be on the correct side of the car)

6) Support for different "voice" in different countries.

Countries respond differently to different voices (people in the US might like a more casual tone, wheras people in another country might respond better to a more matter of fact language)