chore(i18n,curriculum): update translations (#41792)

curriculum/challenges/espanol/01-responsive-web-design/basic-css/change-a-variable-for-a-specific-area.md

@@ -23,10 +23,19 @@ La clase `penguin` debe reasignar la variable `--penguin-belly` a `white`.
 
 ```js
 assert(
-  code.match(/\.penguin\s*?{[\s\S]*(?<!background-color: )--penguin-belly\s*?:\s?white\s*?;[\s\S]*}/gi)
+  code.match(/\.penguin\s*?{[\s\S]*--penguin-belly\s*?:\s*?white\s*?;[\s\S]*}/gi)
 );
 ```
 
+La clase `penguin` no debe contener la propiedad `background-color`
+
+```js
+assert(
+  code.match(/^((?!background-color\s*?:\s*?)[\s\S])*$/g)
+);
+```
+
+
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