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

guide/english/javascript/arrow-functions/index.md

@@ -80,7 +80,7 @@ function Person(){
 
 var p = new Person();
 ```
-An arrow function does not have its own `arguments` object. For example, if you do not know the number of arguments passed to a function, instead of using `arguments` you can use the `rest` operator:
+An arrow function does not have its own `arguments` object. For example, if you do not know the number of arguments passed to a function, instead of using `arguments` you can use the `rest` parameter:
 ```javascript
 const myFunc = (...n) => {
   console.log('The first argument is', n[0]);

guide/english/javascript/rest-parameters/index.md

@@ -3,7 +3,7 @@ title: Rest Parameters
 ---
 
 ## Rest Parameters
-In ES6, the rest paramter syntax `...` allows you to gather up an indefinite number of arguments into an array. 
+In ES6, the rest parameter syntax `...` allows you to gather up an indefinite number of arguments into an array.
 
 Even though they look the same, it does the opposite of the spread operator, which takes every item from an iterable and spreads them out into their individual values. 
 
@@ -18,7 +18,7 @@ myFunc( 1, 2, 3, 4, 5);       // [1,2,3,4,5]
 
 ```
 
-You can prefix a function's last parameter with `...` when you want to do something with the initial paramters and then treat all of the remaining parameters differently. 
+You can prefix a function's last parameter with `...` when you want to do something with the initial parameters and then treat all of the remaining parameters differently. 
 
 ```js
 function convertCurrency(rate, fee, ...amounts) {

guide/english/javascript/standard-objects/function/function-length/index.md

@@ -18,9 +18,9 @@ console.log(oneArg.length); // 1
 
 ### ES2015 Syntax
 
-ES2015, or ES6 as it is commonly called, introduced the rest operator and default function parameters. Both of these additions change the way the `length` property works.
+ES2015, or ES6 as it is commonly called, introduced the rest parameter and default function parameters. Both of these additions change the way the `length` property works.
 
-If either the rest operator or default parameters are used in a function declaration the `length` property will only include the number of arguments before a rest operator or a default parameter.
+If either the rest parameter or default parameters are used in a function declaration the `length` property will only include the number of arguments before a rest parameter or a default parameter.
 
 ```javascript
 function withRest(...args) { }