Corrected capitalization, corrected to American spellings and typos (#30685)

* Translate challenge subtitles and example challenge text to Spanish

* Corrected errors in syntax and punctuation

* Multiple corrections of it/s to its plus other grammar corrections

* Correction and added paragraph to CSS Flex article

* Corrected my own typo

* Corrected capitalization, American spellings and typos

guide/english/certifications/javascript-algorithms-and-data-structures/es6/create-strings-using-template-literals/index.md

@@ -32,7 +32,7 @@ It's required to use template literals to return a list as every element in the
 ```const resultDisplayArray = arr.map(item => `<li class="text-warning">${item}</li>`);```
 
 ## No map() solution
-Despite it's a less flexible solution, if you know the number of elements in advance, you can enumerate them as in
+Despite being a less flexible solution, if you know the number of elements in advance, you can enumerate them as in
 
 ```const resultDisplayArray = [`<li class="text-warning">${arr[0]}</li>`,
   `<li class="text-warning">${arr[1]}</li>`