Fixed Sign Up and Tips translation. Fixed several translations into Spanish

[Yovaxox]

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name: "#94 Translate header/footer items" about: "I'm ready to check in some code to fix an issue!" title: "2021-11-9: Translate header/footer items" assignee: colinalford

Closes #<#94>

Please check if the PR fulfills these requirements

• [X] The title contains the issue number if fulfills and a concise description of the changes
• [X] These changes are related to an open issue

What changes are you introducing? Spanish corrections in translation.json file and Header.js (this one wasn't updating the header texts) Pd. Please give me feedback on my first pull request and sorry my bad English 😥.

Screenshots or Video:

[ejaxon]

This looks good! I'll do the actual merge on the weekend when I have more time.