Adding Spanish for the back end

[Romerolweb]

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• [ x] I have read the contributing guidelines.
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[github-actions]

Thank you for your submission, we really appreciate it. Like many open-source projects, we ask that you all sign our Contributor License Agreement before we can accept your contribution. You can sign the CLA by just posting a Pull Request Comment same as the below format.

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I have read the CLA Document and I hereby sign the CLA

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1 out of 2 committers have signed the CLA.
✅ (MichaelYuhe)[https://github.com/MichaelYuhe]
❌ @Romerolweb
_{You can retrigger this bot by commenting recheck in this Pull Request. Posted by the CLA Assistant Lite bot.}

[daveearley]

Thanks for this @Romerolweb!