Summary:
They don't have any API/ABI guarantees, so the namelink would be mostly
useless anyway.

Test Plan: Built, .so links not installed anymore.

Reviewers: #artikulate, cordlandwehr

Reviewed By: #artikulate, cordlandwehr

Subscribers: aacid, kde-edu

Tags: #kde_edu

Differential Revision: https://phabricator.kde.org/D22280

Note: this change removes language filtering in the base course
model, because filtering should only be done in a special filter
model.

In case of conflict in i18n, keep the version of the branch "ours"
To resolve a particular conflict, "git checkout --ours path/to/file.desktop"

- avoid string puzzles
- add few contexts where needed
- HIG style fixes
- convert from qsTr()

Having null-parent leads to QQmlEngine assuming ownership.