In the save game file, search for "axis", which will take you straight to what you're looking for. If you're at war, you could also (if you choose) search for "attackers" until you find the war you are currently engaged in. In each case, delete everything containing "HUN". This is simply "HUN" under "axis", and then, in the war section, "HUN = { }" under "attackerscore" and "HUN" under "attackers". The quotation marks are added by me and should not be included in your searching.
Hope this helps.