Many users on platforms like Spiceworks and Super User discuss a manual workaround if you already have the German files but want to toggle them:
Unlike modern Creative Cloud versions, Photoshop CS6 language availability was primarily determined by the initial installer used or the license purchased. Multilingual Installer: If you have the original Photoshop CS6 installer (typically the adobe photoshop cs6 german language pack download
If you have the language files (often found in the locales folder of a German installer), you can manually swap them: : C:\Program Files\Adobe\Adobe Photoshop CS6\Locales . Many users on platforms like Spiceworks and Super
– affects menus, dialogs, tooltips, and some filters. and some filters.