Unify i18n strings from QML to allow extraction

Summary:
Apparently adding strings on multiple lines does not allow them to be
extracted by our gettext invocations. So unify the long strings, but at
the same time break them into different labels to make shorter single
items.

Test Plan: Checked at least the debug area messages.

Reviewers: KDevelop, apol

Reviewed By: KDevelop, apol

Subscribers: kdevelop-devel

Differential Revision: https://phabricator.kde.org/D2321