internationalization for usage and exceptions

[coopstah13]

Internationalization works for our code, @Parameters, @Parameter, but none of your code is internationalized and there is no support for it.

Specifically in a case where I'm printing out the usage, it will always print out in english. When a parse exception occurs, such as if a required option is missing, it prints out in english that an option is missing.

Is there any plan on supporting this? It seems someone a year ago attempted to do it: #114

Disclaimer: I have not gone through above pull request, only found it by searching repository for an issue asking for this feature.