Adds Spanish translations

[macagua]

Is your feature request related to a problem? Please describe.

We need NPM in Spanish, to facilitate access to people with low economic resources or in rural areas, who only speak Spanish.

Describe the solution you'd like

I've started by adding translations to the "frontend/js/i18n/messages.json" file.

[github-actions]

Issue is now considered stale. If you want to keep it open, please comment 👍

[github-actions]

Issue was closed due to inactivity.