xfce打开保存对话框的路径栏不显示中文按钮

I am using Debian 9, xfce. As the screen capture shows, the pathbar in any open save dialog box shows only directory name but not the button. That makes it hard to read. And my GUI language is set to be Chinese. enter image description here

这是我的语言环境输出,如果它有助于找出问题所在。请帮忙。

LANG=zh_CN.UTF-8
LANGUAGE=zh_CN:zh
LC_CTYPE=en_US.utf8
LC_NUMERIC="zh_CN.UTF-8"
LC_TIME="zh_CN.UTF-8"
LC_COLLATE="zh_CN.UTF-8"
LC_MONETARY="zh_CN.UTF-8"
LC_MESSAGES="zh_CN.UTF-8"
LC_PAPER="zh_CN.UTF-8"
LC_NAME="zh_CN.UTF-8"
LC_ADDRESS="zh_CN.UTF-8"
LC_TELEPHONE="zh_CN.UTF-8"
LC_MEASUREMENT="zh_CN.UTF-8"
LC_IDENTIFICATION="zh_CN.UTF-8"
LC_ALL=