create global localization object

[davelandry]

Localization is something that we've supported in the past that has not been properly addressed in the new version of d3plus. D3 contains some great time formatters, so let's implement a solution that combines any built-ins we can find with more specific word localizations (like the text for the "back" button).

My current idea is to have a global locale object exported by this module, and that object would contain keys for each language, which then in turn contain keys for specific types of localizations. An example format is here:

export default {
  "en-US": {
    time: {...}, // object imported from d3-time-format
    text: {
      back: "Back",
      ...
    }
  },
  "es-ES": {
    time: {...}, // object imported from d3-time-format
    text: {
      back: "Volver",
      ...
    }
  }
}

This object would be created in src/locale/index.js, importing all of the d3-time-format language modules, and importing our own modules from files like src/locale/text/es-ES.js. We would then add a .locale("es-ES") method to BaseClass so that every component can support localization.

@cnavarreteliz, @nbond211, thoughts?

[cnavarreteliz]

can I close this issue @davelandry ?