Add the ability to handle I18n in email templates

[alveshelio]

In order to be able to create an email template for each supported locale we could add a column locale to authorizer_users table, this table should support locale https://en.wikipedia.org/wiki/List_of_ISO_639-1_codes and country https://en.wikipedia.org/wiki/List_of_ISO_3166_country_codes. Example: en-US, en-CA, fr-FR, fr-CA, etc.

When creating a new email template for let's say for Sign Up, we should be able to add the locale we want to create. We could maybe have a dropdown for the locales we have and the ability to add locales.

This would probably mean having a table for the supported locales or something else that would allows us to define the locales we want to support.