Use GrantleeTheme::GenericFormatter

Summary:
This enables the use of i18n commands in addressbook printing templates,
and thus eventually allows the removal of the property hacks in here for
this.

Reviewers: dvratil

Reviewed By: dvratil

Subscribers: kde-pim

Tags: #kde_pim

Differential Revision: https://phabricator.kde.org/D20989