[Localization] Migrate Spanish source content from es-XL to es-ES (gi…

…thub#22048)

* chore: migrate from es-XL to es-ES in languages module

This commit is inspired by github/docs-internal@b6a2762, in an attempt to have the most up-to-date translations available in es-ES since es-XL is no longer maintained nor updated.

* fix: remove all non-existent translated release notes

* build: run CI on all enabled languages

* build: update app.json to enable English + set size to standard-2x

* fix: s/EN/en

Co-authored-by: Rachael Sewell <rachmari@github.com>

lib/languages.js

@@ -31,7 +31,7 @@ const languages = {
     nativeName: 'Español',
     code: 'es',
     hreflang: 'es',
-    dir: 'translations/es-XL',
+    dir: 'translations/es-ES',
     wip: false,
   },
   pt: {