[Notifications] Fix translations in popup

Authored by broulik on May 27 2019, 7:46 AM.

Description

[Notifications] Fix translations in popup

The popup is a pure QML singleton and as such doesn't inherit the i18n context from the applet. Use i18nd explicitly.

BUG: 407927

Differential Revision: https://phabricator.kde.org/D21422