Fragment indices are being returned instead of fragments, and it does not seem that the extension formatters are being called at all. But... config is definitely improved in the
right direction.
Not working for two reasons:
1. `lein npm install` does not build packages on MacOS;
2. `{% ifequal js-from ":cloudflare" %}` breaks Selmer in wiki.html but not in edit.html - WTF?
Rather nice and satisfactory. Slightly conflates the issue of configuration and internationalisation at present, but I think internationalisation is a target to hit as a separate job.
