Describe the bug
Here is a test csv with Chinese column headers:
第一列,第二列,第三列
a1,b1,c1
a2,b2,c2
a3,b3,c3
Import the csv file and select the text classification template as project lable config.
In Labeling Interface page, UI preview cannot load the example text correctly; instead, it mistakenly treats the $第一列 as a string.

The same goes for the Labeling page.

To Reproduce
Steps to reproduce the behavior:
- Create a project.
- Import a csv file with Chinese column headers.
- Select a text template for the project.
- Go to labeling page.
- All labeling text is a same string like
$第一列.
Expected behavior
The displayed text should be the text in the corresponding row of the specified column in the csv file.
Environment (please complete the following information):
- OS: Ubuntu
- Label Studio Version 1.15.0