Update README.md

Author: nedimf

README.md

@@ -6,9 +6,10 @@ From basic to advanced: test how well you know JavaScript, refresh your knowledg
 
 The answers are in the collapsed sections below the questions, simply click on them to expand it. Good luck :heart:
 
-[中文版本](./README-zh_CN.md)
-
-[WESTERN BALKAN](./README-bs.md)
+[中文版本](./README-zh_CN.md)  
+[Русский](./README_ru-RU.md)  
+[Western Balkan](./README-bs.md)  
+[Deutsch](./README-de_DE.md)  
 
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@@ -1249,7 +1250,7 @@ Then, `[1, 2, 0, 1]` is `acc` and `[2, 3]` is `cur`. We concatenate them, and ge
 
 ---
 
-###### 42. What does the `setInterval` method return?
+###### 42. What does the `setInterval` method return in the browser?
 
 ```javascript
 setInterval(() => console.log("Hi"), 1000);