Re-translate the Japanese version (#1871)

* Retranslate Japanese docs with GPT-5.4

* Retranslate Japanese code with GPT-5.4

ja/codes/kotlin/chapter_hashing/simple_hash.kt

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+/**
+ * File: simple_hash.kt
+ * Created Time: 2024-01-25
+ * Author: curtishd (1023632660@qq.com)
+ */
+
+package chapter_hashing
+
+/* 加算ハッシュ */
+fun addHash(key: String): Int {
+    var hash = 0L
+    val MODULUS = 1000000007
+    for (c in key.toCharArray()) {
+        hash = (hash + c.code) % MODULUS
+    }
+    return hash.toInt()
+}
+
+/* 乗算ハッシュ */
+fun mulHash(key: String): Int {
+    var hash = 0L
+    val MODULUS = 1000000007
+    for (c in key.toCharArray()) {
+        hash = (31 * hash + c.code) % MODULUS
+    }
+    return hash.toInt()
+}
+
+/* XOR ハッシュ */
+fun xorHash(key: String): Int {
+    var hash = 0
+    val MODULUS = 1000000007
+    for (c in key.toCharArray()) {
+        hash = hash xor c.code
+    }
+    return hash and MODULUS
+}
+
+/* 回転ハッシュ */
+fun rotHash(key: String): Int {
+    var hash = 0L
+    val MODULUS = 1000000007
+    for (c in key.toCharArray()) {
+        hash = ((hash shl 4) xor (hash shr 28) xor c.code.toLong()) % MODULUS
+    }
+    return hash.toInt()
+}
+
+/* Driver Code */
+fun main() {
+    val key = "Hello アルゴリズム"
+
+    var hash = addHash(key)
+    println("加算ハッシュ値は $hash")
+
+    hash = mulHash(key)
+    println("乗算ハッシュ値は $hash")
+
+    hash = xorHash(key)
+    println("XORハッシュ値は $hash")
+
+    hash = rotHash(key)
+    println("回転ハッシュ値は $hash")
+}