Change "rest operator" to say "rest parameter" in challenges and guide (#35496)

* change es6 challenges rest operator to param

* fix rest parameter typos

* change rest operator to parameter in guide

* fix casing

* change rest operator to rest parameter in guide

* change rest operator to rest parameter in curriculum

* remove extra whitespace

* remove whitespaces

* remove whitespace

* fix: removed arabic file

* fix: removed chinese file

curriculum/challenges/english/02-javascript-algorithms-and-data-structures/es6/use-destructuring-assignment-with-the-rest-parameter-to-reassign-array-elements.english.md

@@ -1,6 +1,6 @@
 ---
 id: 587d7b8a367417b2b2512b4c
-title: Use Destructuring Assignment with the Rest Operator to Reassign Array Elements
+title: Use Destructuring Assignment with the Rest Parameter to Reassign Array Elements
 challengeType: 1
 ---
 
@@ -9,13 +9,13 @@ challengeType: 1
 In some situations involving array destructuring, we might want to collect the rest of the elements into a separate array.
 The result is similar to <code>Array.prototype.slice()</code>, as shown below:
 <blockquote>const [a, b, ...arr] = [1, 2, 3, 4, 5, 7];<br>console.log(a, b); // 1, 2<br>console.log(arr); // [3, 4, 5, 7]</blockquote>
-Variables <code>a</code> and <code>b</code> take the first and second values from the array. After that, because of rest operator's presence, <code>arr</code> gets rest of the values in the form of an array.
-The rest element only works correctly as the last variable in the list. As in, you cannot use the rest operator to catch a subarray that leaves out last element of the original array.
+Variables <code>a</code> and <code>b</code> take the first and second values from the array. After that, because of rest parameter's presence, <code>arr</code> gets rest of the values in the form of an array.
+The rest element only works correctly as the last variable in the list. As in, you cannot use the rest parameter to catch a subarray that leaves out last element of the original array.
 </section>
 
 ## Instructions
 <section id='instructions'>
-Use destructuring assignment with the rest operator to perform an effective <code>Array.prototype.slice()</code> so that <code>arr</code> is a sub-array of the original array <code>source</code> with the first two elements omitted.
+Use destructuring assignment with the rest parameter to perform an effective <code>Array.prototype.slice()</code> so that <code>arr</code> is a sub-array of the original array <code>source</code> with the first two elements omitted.
 </section>
 
 ## Tests

curriculum/challenges/english/02-javascript-algorithms-and-data-structures/es6/use-the-rest-parameter-with-function-parameters.english.md

@@ -1,15 +1,15 @@
 ---
 id: 587d7b88367417b2b2512b47
-title: Use the Rest Operator with Function Parameters
+title: Use the Rest Parameter with Function Parameters
 challengeType: 1
 ---
 
 ## Description
 <section id='description'>
-In order to help us create more flexible functions, ES6 introduces the <dfn>rest operator</dfn> for function parameters. With the rest operator, you can create functions that take a variable number of arguments. These arguments are stored in an array that can be accessed later from inside the function.
+In order to help us create more flexible functions, ES6 introduces the <dfn>rest parameter</dfn> for function parameters. With the rest parameter, you can create functions that take a variable number of arguments. These arguments are stored in an array that can be accessed later from inside the function.
 Check out this code:
-<blockquote>function howMany(...args) {<br>&nbsp;&nbsp;return "You have passed " + args.length + " arguments.";<br>}<br>console.log(howMany(0, 1, 2)); // You have passed 3 arguments.<br>console.log(howMany("string", null, [1, 2, 3], { })); // You have passed 4 arguments.</blockquote>
-The rest operator eliminates the need to check the <code>args</code> array and allows us to apply <code>map()</code>, <code>filter()</code> and <code>reduce()</code> on the parameters array.
+<blockquote>function howMany(...args) {<br>&nbsp;&nbsp;return "You have passed " + args.length + " arguments.";<br>}<br>console.log(howMany(0, 1, 2)); // You have passed 3 arguments<br>console.log(howMany("string", null, [1, 2, 3], { })); // You have passed 4 arguments.</blockquote>
+The rest parameter eliminates the need to check the <code>args</code> array and allows us to apply <code>map()</code>, <code>filter()</code> and <code>reduce()</code> on the parameters array.
 </section>
 
 ## Instructions