I had the issue with the fakeFont as others had.  I found an easier solution than trying to sort through the css files and other solutions that were posted. 

If you have this problem, you can easily solve it this way:

1.  Find a windows ttf font file and copy it into your Fonts directory of your project.  

2.  Open this font file using a program like FontForge

3.  Change all font information such as font name, friendly name, etc. to fakeFont (in FontForge this is done by going to the Element, Font Info menu item)

4.  Generate the new font file (in FontForge it's File, Generate Fonts) and select TTF from the dropdown menu for file type.

5. Install this "new" fakeFont by right clicking on the new file and install for all users.

6.  You can then go back into Website X5 and add this "fakeFont" file as a font.  This will eleminate the fakeFont message/issue on startup