Partial because the helper method is not the preferred way
anymore to create an icon. So I simplified the detection
to only check whether the given icon is a legacy one, as
those are smaller in number. Though, this leads to some fa
icons being identified as legacy, as the names equal. But,
it's the legacy helper after all... Anyone wanting to make
sure to get fontawesome icons, must add the `fa-` prefix.
e34c174db9