noosfero | i18n: add countries default and change format (- instead of _) (#613)

[Bráulio Bhavamitra]

New comment for Merge Request 613

https://gitlab.com/noosfero/noosfero/merge_requests/613#note_1521353


Bráulio Bhavamitra

this includes a bugfix that default `en` to `en-US`

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