Slug only gets translated if transRoute is used.

[Krypto89]

Describe the bug
Slug is not translated if transRoute is not used, although those are different features.

To Reproduce
If you do not used transRoute but translated slugs
substituteAttributesInRoute($attributes, $route, $locale);
gets never called and therefore the slug doesn't get translated.

If transRoute is used in combination with translated slugs
$this->substituteAttributesInRoute($attributes, $route, $locale);
get's called and therefore it's working.

This is the call which handles translated slugs:
https://github.com/mcamara/laravel-localization/blob/master/src/Mcamara/LaravelLocalization/LaravelLocalization.php#L383