Re-translate the Japanese version (#1871)

* Retranslate Japanese docs with GPT-5.4

* Retranslate Japanese code with GPT-5.4

ja/codes/javascript/chapter_hashing/simple_hash.js

@@ -0,0 +1,60 @@
+/**
+ * File: simple_hash.js
+ * Created Time: 2023-08-06
+ * Author: yuan0221 (yl1452491917@gmail.com)
+ */
+
+/* 加算ハッシュ */
+function addHash(key) {
+    let hash = 0;
+    const MODULUS = 1000000007;
+    for (const c of key) {
+        hash = (hash + c.charCodeAt(0)) % MODULUS;
+    }
+    return hash;
+}
+
+/* 乗算ハッシュ */
+function mulHash(key) {
+    let hash = 0;
+    const MODULUS = 1000000007;
+    for (const c of key) {
+        hash = (31 * hash + c.charCodeAt(0)) % MODULUS;
+    }
+    return hash;
+}
+
+/* XOR ハッシュ */
+function xorHash(key) {
+    let hash = 0;
+    const MODULUS = 1000000007;
+    for (const c of key) {
+        hash ^= c.charCodeAt(0);
+    }
+    return hash % MODULUS;
+}
+
+/* 回転ハッシュ */
+function rotHash(key) {
+    let hash = 0;
+    const MODULUS = 1000000007;
+    for (const c of key) {
+        hash = ((hash << 4) ^ (hash >> 28) ^ c.charCodeAt(0)) % MODULUS;
+    }
+    return hash;
+}
+
+/* Driver Code */
+const key = 'Hello アルゴリズム';
+
+let hash = addHash(key);
+console.log('加算ハッシュ値は ' + hash);
+
+hash = mulHash(key);
+console.log('乗算ハッシュ値は ' + hash);
+
+hash = xorHash(key);
+console.log('XORハッシュ値は ' + hash);
+
+hash = rotHash(key);
+console.log('回転ハッシュ値は ' + hash);