Unfortunately, there are certain settings that need to be made when the file is saved on the developer end to fix it so hopefully the Crafty guys, or whoever created the sheet, can make the fix fairly easily.
If you need it sooner than that, there are some 3rd party pdf readers that can save those form filled documents. I use one called Foxit Reader
that is free and can view and save those form fillable docs that Adobe's pdf reader can't, or just won't, do. I just downloaded the French character sheet, tested it and I was able to edit fields and save the content using that reader.