I was able to get some of these to upload by dropping the diacritics off the letters like so:
Dandan
Ghazban Ogre
Jotun Grunt
Junun Efreet
Lim-Dul's Vault
However, I was unable to find a work around for:
The Ultimate Nightmare of Wizards of the Coast® Customer Service
Was anyone else able to find a way to import that card?