Add localizations for countries

[hantuzun]

Prerequisite: #4

We could have locales for all of the 247 country codes here: https://github.com/loureirorg/city-state/blob/master/lib/db/countries.yml

These locals should:

• Have a default country
• Have a default language
• Have different domains in the following format: ${COUNTRY_CODE}.pandemicvolunteers.org

[hantuzun]

Let's open this when this's in our roadmap.