Add i18n Support

[fazlurr]

I think it would be helpful to add an option to include i18n plugin or library to the project.

[crutkas]

do you have any recommendations? All text should be already put into resource files.

[jsondoo]

We current localize all our strings on the client and the extension: https://github.com/microsoft/WebTemplateStudio/wiki/Internationalization

Extra work is still needed to detect the user's locale, and also send our resource files off to be translated since we currently only support English.