Revert "Camera2: DE translation"

This reverts commit afd660cdad4f3e13486b9531552b5f4a148b0a20.

there is a string now twice which is an error
packages/apps/Camera2/res/values-de/strings.xml:126: error: Resource entry pref_camera_picturesize_entry_1_5mp is already defined.

Change-Id: I8c450e4fc3197e4e59fa9300e64eaad4a2a5e2be