shutdown: update Spanish translation

[kant]

Checklist

• The page(s) are in the correct platform directories: common, linux, osx, windows, sunos, android, etc.
• The page description(s) have links to documentation or a homepage.
• The page(s) follow the content guidelines.
• The page(s) follow the style guide.
• The PR contains at most 5 new pages.
• The PR is authored by me, or has been human-reviewed if it was created with AI or machine translation software.
• The PR title conforms to the recommended templates.
• Version of the command being documented (if known):
• Reference issue: #
• Closes: #

[Managor]

Again @kant. I ask you to put these small changes in a single PR.

[kant]

My technical resources can not handle multiple petition. Sorry about that.

[Managor]

Ok, let me teach you. I'll do a step by step guide for you

1. Edit a file like you've done before
2. Do not submit the pull request yet
3. Go to the front page of the repo and click on the branch name (marked as test here)

4. Search any page you want to modify

Now your changes get saved into the same branch. Once you're done, head to the pull request tab and click on Compare and pull request