[ES][2020] 2020 JavaScript Spanish Translation (#2261)

* Translate metadata and introduction of JavaScript article to Spanish

* Translate Javascript use section to Spanish

* Translate Javascript module nomodule section to Spanish

* Translate javascript requests section to Spanish

* Translate javascript increase reason section to Spanish

* Translate javascript loading section to Spanish

* Translate javascript resource hints section to Spanish

* Translate javascript serving section to Spanish

* Translate javascript compression section to spanish

* Properly capitalize javascript

* Translate javascript libraries section to spanish

* Partially translate usage meaning javascript section to spanish

* Finish translation of the usage meaning section to spanish

* Translate javascript impact section to spanish

* Translate Javascript Lighthouse correlation section to spanish

* Translate javascript vulnerabilities section to spanish

* Translate javascript conclusion to spanish

* Add translator profile

* Apply spellcheck and grammar check

* Apply suggestions from code review

Co-authored-by: Barry Pollard <[email protected]>

src/config/2020.json

@@ -233,7 +233,16 @@
       "website": "https://AhmadAwais.com",
       "github": "ahmadawais",
       "twitter": "MrAhmadAwais"
-    } ,
+    },
+    "alangdm": {
+      "name": "Alan Dávalos",
+      "teams": [
+        "translators"
+      ],
+      "avatar_url": "https://avatars.githubusercontent.com/u/6799159?v=4&s=200",
+      "github": "alangdm",
+      "twitter": "AlanGDavalos"
+    },
     "alankent": {
       "name": "Alan Kent",
       "teams": [