In the German localization of Lightroom CC/6 (v6.0.1) there is a bug that causes the right panel to overflow the window when a filter is selected. This seems to be caused by the sliders being resized to quite exactly 150% the width of the normal sliders.
This is caused by the new brush feature for the gradient and radial filter. When the brush is selected on the top ("Neu" / "Bearbeiten" / "Pinsel"), there are now three actions available at the bottom: Reset brushes (this one is new), Reset and Close, which is "Pinsel zurücksetzen", "Zurücksetzen" und "Schließen" in German. Those three texts are too wide for the minmum pane widht configured for the German localization, so the internal layouter seems to extend the whole pane to the right "into nowhere" - even if the brush mode is not currently enganged.
A solution would be to increase the minmum pane widht (@Adobe: please don't do that), or to radically shorten one of the texts. I shortened the "Pinsel zurücksetzen" to "P. zur.", and now everything looks fine.
To do that, change the following line in the Resources\de\TranslatedStrings.txt file:
You will need an editor that properly handles Unicode (UTF-8) files. On Windows, the simple notepad.exe seems to be fine. Remember to make a backup of the original file.
P.S. I don't know at present which line changes the minmum pane widht, but I really don't want to make it wider because the German localization is already really wide, and any wider would be a problem for 4:3 monitors (ok, they become rare, but I still have one).
EDIT: I asked the same question in another post regarding a localization error for German (http://feedback.photoshop.com/photosh...): I know there is an Adobe website out there where you can contribute to and propose changes to the localizations of Adobe applications - but I don't remember it, and I can't find it via google (anymore). Does someone know the website?