Adding i18n to frontend

[polvoazul]

Lets make an MVP for i18n (internationalisation) of the BD frontend.

Tasks:

• [ ] Language selector: as parameter www.basedosdados.org?language=en or in path www.basedosdados.org/en?
• [ ] Buy new domains: www.databasis.org, www.basedelosdatos.org.
• [ ] Redirects. Example: www.basedosdados.org/precos/en -> www.databasis.org/prices.
• [ ] Map calls to metadata variables by language selected.
• [ ] Map calls to BigQuery tables by language selected.
• [ ] Populate rewrites.
• [ ] Add Spanish.