Add icon to add new tag action
Summary:
Reviewers: PHID-PROJ-f4qsgvw5tq3pocqbpyu5, KDE PIM: KMail, vkrause
Reviewed By: PHID-PROJ-f4qsgvw5tq3pocqbpyu5, vkrause
Subscribers: vkrause, kde-pim
Tags: KDE PIM
Differential Revision: https://phabricator.kde.org/D26377