Add ENS swag banner translation to Spanish

[ernestognw]

Description

The title is pretty self-descriptive 😄

Screenshots:

Checklist:

• [x] My code follows the code style of this project.
• [x] My code implements all the required features.

[LeonmanRolls]

Thanks for the PR, apologies for not merging in time.

[ernestognw]

No problem, thanks! I met Nick Johnson at Devcon for this so no issues ❤️