Add trans filter to twig templates

[Vainonen]

Description of the enhancement

Adding trans filters of Symfony to existing twig templates in skosmos-3 branch.

Who are the users that would benefit from the enhancement and how?

All Skosmos developers

What new functionalities would the enhancement make possible?

Translating text in twig templates

Why is the enhancement important?

Trans filters using syntax of older twig extensions were removed and need to be replaced by new syntax.