Chinese support got an issue

Hi, I am new to `up` and encountered an issue while using it.
When the file is in Chinese, the characters are not displayed normally in the program
```
$ cat 1.txt
吃饭
喝茶
睡觉
```
Inside `up`, it showed only one character
```
cat 1.txt | up 
 |
吃
喝
睡
```
And `grep` cannot work well either.