Update es.toml (#559)

* Update es.toml

Added missing i18n tags to the Spanish translation.

* Update CONTRIBUTORS.md

i18n/es.toml

@@ -1,15 +1,24 @@
 [category]
 other = "categoría"
 
+[categories]
+other = "categorías"
+
 [tag]
 other = "etiqueta"
 
+[tags]
+other = "etiquetas"
+
 [series]
 other = "serie"
 
 [author]
 other = "autor"
 
+[authors]
+other = "autores"
+
 [posts]
 other = "publicaciones"
 
@@ -31,3 +40,24 @@ other = "Desarrollado por"
 
 [see_also]
 other = "También ver en"
+
+[note]
+other = "nota"
+
+[tip]
+other = "consejo"
+
+[example]
+other = "ejemplo"
+
+[question]
+other = "pregunta"
+
+[info]
+other = "información"
+
+[warning]
+other = "advertencia"
+
+[error]
+other = "error"