refactor: update UI text and error messages to English for better accessibility

model/redemption.go

@@ -40,7 +40,7 @@ func SearchRedemptions(keyword string) (redemptions []*Redemption, err error) {
 
 func GetRedemptionById(id int) (*Redemption, error) {
 	if id == 0 {
-		return nil, errors.New("id 为空！")
+		return nil, errors.New("id is empty!")
 	}
 	redemption := Redemption{Id: id}
 	var err error = nil
@@ -50,10 +50,10 @@ func GetRedemptionById(id int) (*Redemption, error) {
 
 func Redeem(key string, userId int) (quota int64, err error) {
 	if key == "" {
-		return 0, errors.New("未提供兑换码")
+		return 0, errors.New("No redemption code provided")
 	}
 	if userId == 0 {
-		return 0, errors.New("无效的 user id")
+		return 0, errors.New("Invalid user id")
 	}
 	redemption := &Redemption{}
 
@@ -65,10 +65,10 @@ func Redeem(key string, userId int) (quota int64, err error) {
 	err = DB.Transaction(func(tx *gorm.DB) error {
 		err := tx.Set("gorm:query_option", "FOR UPDATE").Where(keyCol+" = ?", key).First(redemption).Error
 		if err != nil {
-			return errors.New("无效的兑换码")
+			return errors.New("Invalid redemption code")
 		}
 		if redemption.Status != RedemptionCodeStatusEnabled {
-			return errors.New("该兑换码已被使用")
+			return errors.New("The redemption code has been used")
 		}
 		err = tx.Model(&User{}).Where("id = ?", userId).Update("quota", gorm.Expr("quota + ?", redemption.Quota)).Error
 		if err != nil {
@@ -80,9 +80,9 @@ func Redeem(key string, userId int) (quota int64, err error) {
 		return err
 	})
 	if err != nil {
-		return 0, errors.New("兑换失败，" + err.Error())
+		return 0, errors.New("Redeem失败，" + err.Error())
 	}
-	RecordLog(userId, LogTypeTopup, fmt.Sprintf("通过兑换码充值 %s", common.LogQuota(redemption.Quota)))
+	RecordLog(userId, LogTypeTopup, fmt.Sprintf("Recharge %s through redemption code", common.LogQuota(redemption.Quota)))
 	return redemption.Quota, nil
 }
 
@@ -112,7 +112,7 @@ func (redemption *Redemption) Delete() error {
 
 func DeleteRedemptionById(id int) (err error) {
 	if id == 0 {
-		return errors.New("id 为空！")
+		return errors.New("id is empty!")
 	}
 	redemption := Redemption{Id: id}
 	err = DB.Where(redemption).First(&redemption).Error