* DEV: Use named parameters for dir-span helper
Follow up to: e50a5c0c73d8f983286b50ac45e10ce52924269e
In order to improve code clarity this change introduces named parameters
for the dir-span helper. This is specifically for the new `htmlSafe`
parameter which you can use instead of just passing in a boolean if the
strings you are passing in have already been escaped.
Before: `{{dir-span category.description false}}`
After: `{{dir-span category.description htmlSafe=true}}`
* Set default value for params arg