README fixes.

Author: trekhleb

src/algorithms/cryptography/caesar-cipher/README.md

@@ -1,5 +1,8 @@
 # Caesar Cipher Algorithm
 
+_Read this in other languages:_
+[_Русский_](README.ru-RU.md)
+
 In cryptography, a **Caesar cipher**, also known as **Caesar's cipher**, the **shift cipher**, **Caesar's code** or **Caesar shift**, is one of the simplest and most widely known encryption techniques. It is a type of substitution cipher in which each letter in the plaintext is replaced by a letter some fixed number of positions down the alphabet. For example, with a left shift of `3`, `D` would be replaced by `A`, `E` would become `B`, and so on. The method is named after Julius Caesar, who used it in his private correspondence.
 
 ![Caesar Cipher Algorithm](https://upload.wikimedia.org/wikipedia/commons/4/4a/Caesar_cipher_left_shift_of_3.svg)

src/algorithms/linked-list/traversal/README.md

@@ -1,7 +1,7 @@
 # Linked List Traversal
 
 _Read this in other languages:_
-[_Русский_](README.ru-RU.md)
+[_Русский_](README.ru-RU.md),
 [中文](README.zh-CN.md)
 
 The task is to traverse the given linked list in straight order.

src/algorithms/string/knuth-morris-pratt/knuthMorrisPratt.js

@@ -43,7 +43,7 @@ export default function knuthMorrisPratt(text, word) {
     if (text[textIndex] === word[wordIndex]) {
       // We've found a match.
       if (wordIndex === word.length - 1) {
-        return textIndex - word.length + 1;
+        return (textIndex - word.length) + 1;
       }
       wordIndex += 1;
       textIndex += 1;