Security fix for possible Cross-site-scripting (XSS) attack

Reference : 
https://sonarcloud.io/project/security_hotspots?id=shuchu_feast&hotspots=AY9leJjfaz5TZ8maDgoc
https://sonarcloud.io/project/security_hotspots?id=shuchu_feast&hotspots=AY9leJk3az5TZ8maDgo8

### Specifications

- Version: 
- Platform:
- Subsystem:

## Possible Solution

Set the `autoescape=True` in Jinjia2 `Environment()`