[Docs/tutorials] internationalization

[simonhoyos]

Summary

I noticed that there are only two parts of the docs/tutorials translated to Spanish and I couldn't find any issue related to that. If nobody is working on those I would like to help with that task 😄. Let me know, I can start right away.

Relevant information

Environment (if relevant)

File contents (if changed)

gatsby-config.js: N/A
package.json: N/A
gatsby-node.js: N/A
gatsby-browser.js: N/A
gatsby-ssr.js: N/A

[LekoArts]

Closing this issue as it's not planned to provide languages other than english (too much overhead with keeping them in sync, we can't proofread the translations)