Overriding built-in shortcodes doesn't work

[shadiradio]

Bug Report

Environment

Zola version: 0.15.3

Expected Behavior

Zola includes some built in shortcodes for very common functionality (like YouTube), and the documentation says these can be overridden by placing a file with the same name in the templates/shortcodes path.

Current Behavior

I could not get this to work using Zola 0.15.3. If I place a "youtube.html" file in the templates/shortcodes path, Zola serve & build will still use the built-in YouTube shortcode generator.

Step to reproduce

• Place a custom "youtube.html" shortcode file in templates/shortcodes
• Use the shortcode in some content
• Run "zola serve" and notice the custom code is not output

[Keats]

Looks like a regression in the template loading that changed recently, I'll handle it.