Correct way to update templates?

[sudofox]

I'm trying to use the pxls.space docker container and am struggling a bit to work out how to change the template text. I found the templates in /tmp/public/pebble_templates and also /data/index_en-US_cache.html.

What I'm trying to use it for is a temporary collaborative piece of artwork. However, we need to strip out most of the text, including all profane and racist terms, as well as support links to pxls.space, before we can put it up. What's the correct way to do this? I tried editing the templates and restarting the container, no dice. How can I do this?