[lua/es-es] translate lua guide to spanish

[JorgeLDB]

Translation of lua's guide to spanish using en and pt-br versions as the base.

• [X] I solemnly swear that this is all original content of which I am the original author (just the translation)
• [X] Pull request title is prepended with [language/lang-code] (example [python/fr-fr] or [java/en])
• [X] Pull request touches only one file (or a set of logically related files with similar changes made)
• [X] Content changes are aimed at intermediate to experienced programmers (this is a poor format for explaining fundamental programming concepts)
• [X] If you've changed any part of the YAML Frontmatter, make sure it is formatted according to CONTRIBUTING.md
  • [X] Yes, I have double-checked quotes and field names!