Comment # 6 on bug 1040245 from Moritz Rakow

gnome-tweak-tool-lang: automatically installed in version 3.20.1-4.3
bundle-lang-gnome-de: not found.

Active repos are:

*   openSUSE-Leap-42.3-Oss
*   openSUSE-Leap-42.3-Non-Oss
*   openSUSE-Leap-42.3-Update
*   openSUSE-Leap-42.3-Update-Non-Oss