Re-translate the Japanese version (#1871)

* Retranslate Japanese docs with GPT-5.4

* Retranslate Japanese code with GPT-5.4

ja/codes/go/chapter_backtracking/permutation_test.go

@@ -0,0 +1,33 @@
+// File: permutation_test.go
+// Created Time: 2023-05-09
+// Author: Reanon (793584285@qq.com)
+
+package chapter_backtracking
+
+import (
+	"fmt"
+	"testing"
+
+	. "github.com/krahets/hello-algo/pkg"
+)
+
+func TestPermutationI(t *testing.T) {
+	/* 全順列 I */
+	nums := []int{1, 2, 3}
+	fmt.Printf("入力配列 nums = ")
+	PrintSlice(nums)
+
+	res := permutationsI(nums)
+	fmt.Printf("すべての順列 res = ")
+	fmt.Println(res)
+}
+
+func TestPermutationII(t *testing.T) {
+	nums := []int{1, 2, 2}
+	fmt.Printf("入力配列 nums = ")
+	PrintSlice(nums)
+
+	res := permutationsII(nums)
+	fmt.Printf("すべての順列 res = ")
+	fmt.Println(res)
+}