Add Spanish Translation (#309)

* feat: spanish translation

* fix: missing key `languages.es`

* docs: add `languages.es` in de language

* fix: ensure the copyright year

* docs: fix some translation

* Update src/nginxconfig/i18n/es/templates/domain_sections/routing.js

Co-authored-by: Matt (IPv4) Cowley <me@mattcowley.co.uk>

* Update src/nginxconfig/i18n/es/templates/footer.js

Co-authored-by: Matt (IPv4) Cowley <me@mattcowley.co.uk>

* Update src/nginxconfig/i18n/es/templates/domain_sections/onion.js

Co-authored-by: Matt (IPv4) Cowley <me@mattcowley.co.uk>

Co-authored-by: Matt (IPv4) Cowley <me@mattcowley.co.uk>