fix path error

Makefile

@@ -43,6 +43,7 @@ define Package/luci-app-adguardhome/install
 	cp -pR ./luasrc/* $(1)/usr/lib/lua/luci
 	$(INSTALL_DIR) $(1)/
 	cp -pR ./root/* $(1)/
+	$(INSTALL_DIR) $(1)/usr/lib/lua/luci/i18n
 	po2lmo ./po/zh-cn/AdGuardHome.po $(1)/usr/lib/lua/luci/i18n/AdGuardHome.zh-cn.lmo
 endef