medal add gift_fee_factor and user_medal add priority

resources/lang/zh_CN/message.php

@@ -27,4 +27,8 @@ return [
         'subject' => '临时邀请:change_type',
         'body' => '你的临时邀请被管理员 :operator :change_type :count 个，理由：:reason。',
     ],
+    'receive_medal' => [
+        'subject' => '收到赠送勋章',
+        'body' => '用户 :username 花费魔力 :cost_bonus 购买了勋章[:medal_name]并赠送与你。此勋章价值 :price，手续费 :gift_fee_total(系数：:gift_fee_factor)，你将拥有此勋章有效期至: :expire_at，勋章的魔力加成系数为: :bonus_addition_factor。',
+    ],
 ];