I'm starting with a .SIL file with just English and adding Chinese. Then I use the dictionary to auto-translate all the Chinese and save it. When I try to re-open it I get several errors that "Format specifiers don't match for all languages".
Note: We use ~` as our delimiter, but the default of ~!@# also causes this.
Actually, this is some kind of warning not error, which you can turn of using Options dialog ("Validate files on openning" option)
But the question is: are format specifiers valid and this is false warning or they actually don't match for all languages?