fully self-contained

paths are pretty janky, but it works. Also, [files]/lang_files now must
be the path to a directory CONTAINING a "lang/" directory. I'll work
around this at a later date.

config.go

@@ -15,7 +15,7 @@ var emailEnabled = false
 func (app *appContext) GetPath(sect, key string) (fs.FS, string) {
 	val := app.config.Section(sect).Key(key).MustString("")
 	if strings.HasPrefix(val, "jfa-go:") {
-		return app.localFS, strings.TrimPrefix(val, "jfa-go:")
+		return localFS, "build/data/" + strings.TrimPrefix(val, "jfa-go:")
 	}
 	return app.systemFS, val
 }