updated twig to version 3 and added wrapper for translation via symfony/twig-bridge

Co-authored-by: Ulrik nielsen <un@ipwsystems.dk>

* Use strict variables in Twig, except for our TemplateTest; throw exception on missing variables

* Fix issues due to Twig strict_variables=true

* Fix for #1229

* Fix metadata-template

+twig indentation

- Add class pure-button-red instead of overwriting primary
- Create a group of 2 button-elements where one is hollow, useful
to show input-files or error-ids.
- Update templates accordingly

There may be a simpler fix for this?

Build from status.php uses twig to show the authentication status.