The Rhineland is, and always was, in Germany. After World War 1, Germany was forbidden to station troops there, but it never became an "Area of France". Also it's Afrika Korps with a K, and it was the official name of the corps, not a nickname.
I would not call the 'Final Solution' a 'nickname' for the Holocaust. It was an ambiguous phrase used by Germans in the know, for the extermination of the Jews. It is argued by scholars to this day about how many Germans, even ones in high positions, knew of the real purpose of the 'Final Solution'. Many Germans of the period used the defence that they thought the 'Final Solution' (if they had heard the phrase) meant the resettlement of the Jews in the east. 'Endlosung' in German.