feat: add Spanish translations

[D4NZ-jpg]

Description

Added Spanish translations, and the files required for it

Related Issues / Pull Requests

This closes #1130

Motivation and Context

How Has This Been Tested?

Screenshots (if appropriate)

Checklist

• If the key of a setting is changed, the old attribute is updated or it is resolved in SettingsUpdater.
• If there are changes of the text displayed in the UI, they are wrapped in tr() or QCoreApplication::translate().
• If needed, I have opened a pull request or an issue to update the documentation.
• If these changes are notable, they are documented in CHANGELOG.md.

Additional text

[ouuan]

Looks good to me. You can ask some friends to review it or I can also merge it right now.

[coder3101]

Looks good to me. You can ask some friends to review it or I can also merge it right now.

I think we can merge it, improvements can be done later by other Spanish users.

[D4NZ-jpg]

A friend has already partially reviewed the translations, but in the future, I would like to ask a few more friends to check it more thoroughly. This may take some time, but I think it is ready to be merged for now, and as @coder3101 said, improvements could also be done by other users later on.

[D4NZ-jpg]

@all-contributors please add @D4NZ-jpg for translation

[allcontributors]

@D4NZ-jpg

I've put up a pull request to add @D4NZ-jpg! 🎉