ES translations and menu updates to show ES (#128)

* ES translations and menu updates to show ES

* Missing translations, sibling links and lang tags.

* updated links replace d-historica w/ d-existencial

public/es/_concat.json

@@ -11,9 +11,10 @@
     "public/es/disforia-societal.md",
     "public/es/disforia-sexual.md",
     "public/es/disforia-de-presentacion.md",
-    "public/es/disforia-historica.md",
+    "public/es/disforia-existencial.md",
     "public/es/disforia-gestionada.md",
     "public/es/sindrome-del-impostor.md",
+    "public/es/soy-trans.md",
     "public/es/diagnosticos.md",
     "public/es/tratamiento.md",
     "public/es/causas.md",