Re-translate the Japanese version (#1871)

* Retranslate Japanese docs with GPT-5.4

* Retranslate Japanese code with GPT-5.4

ja/codes/kotlin/chapter_backtracking/permutations_i.kt

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+/**
+ * File: permutations_i.kt
+ * Created Time: 2024-01-25
+ * Author: curtishd (1023632660@qq.com)
+ */
+
+package chapter_backtracking.permutations_i
+
+/* バックトラッキング：順列 I */
+fun backtrack(
+    state: MutableList<Int>,
+    choices: IntArray,
+    selected: BooleanArray,
+    res: MutableList<MutableList<Int>?>
+) {
+    // 状態の長さが要素数に等しければ、解を記録
+    if (state.size == choices.size) {
+        res.add(state.toMutableList())
+        return
+    }
+    // すべての選択肢を走査
+    for (i in choices.indices) {
+        val choice = choices[i]
+        // 枝刈り：要素の重複選択を許可しない
+        if (!selected[i]) {
+            // 試行: 選択を行い、状態を更新
+            selected[i] = true
+            state.add(choice)
+            // 次の選択へ進む
+            backtrack(state, choices, selected, res)
+            // バックトラック：選択を取り消し、前の状態に戻す
+            selected[i] = false
+            state.removeAt(state.size - 1)
+        }
+    }
+}
+
+/* 全順列 I */
+fun permutationsI(nums: IntArray): MutableList<MutableList<Int>?> {
+    val res = mutableListOf<MutableList<Int>?>()
+    backtrack(mutableListOf(), nums, BooleanArray(nums.size), res)
+    return res
+}
+
+/* Driver Code */
+fun main() {
+    val nums = intArrayOf(1, 2, 3)
+
+    val res = permutationsI(nums)
+
+    println("入力配列 nums = ${nums.contentToString()}")
+    println("すべての順列 res = $res")
+}