docs(translation): Add spanish UI translations

[royeden]

Adds generic spanish translations. Generic implies that spanish speakers will understand them, regardless of their regional variant.

This should provide a base for future spanish translations, where regional variants have different words to refer to different concepts (in case that is needed).

• Comment regarding code: If english is the default, and the keys have to match, it could be good to match the type of translation dictionaries to match the keys in the english dictionary.

• Notes on translations:

  {
      // This reads like UIs with no effort, with reactive precision. The comma could be ommited.
  "hero.title": "UIs sin esfuerzo, con precisión reactiva.", 
  
   // Could be a more informal "Empezar ahora"
  "hero.button.primary": "Comenzar ahora",
  
  // This could also be translated as "Derivación de valores", meaning "Value derivation", 
  "main.nav.section.derived.values": "Valores derivados",
  
   // This is a known colloquial translation for "routing", known as an "americanism" to refer to the "correct" term: "Enrutado".
   // I've never personally seen "Enrutado" being used in a technological project / education.
  "main.nav.section.routing": "Ruteo",
  
      // This is another known colloquial translation derived from "render"
  "main.nav.section.rendering": "Renderizado",
  
      // I feel like translating stores might be a bit cumbersome, due to it being a specific API in the project
  "main.nav.section.stores": "Stores",
  
      // Same thing with `Solid-Router`.
  "main.nav.section.solid.router": "Solid-Router",
  
  // Reads like "functions for loading"
  "main.nav.section.solid.router.load.functions": "Funciones de carga",
  }

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