If she's no longer with the company and she was using Flash,
could it by chance be a company license for Flash that you could
take over...?
Rick referred to the LNG file, which exists in both the
source files and the output files. Do the copying and pasting with
the source versions. (The output version will be overwritten from
the source version every time.)
If Rick's suggestion doesn't work, the only other thing I can
think of would be to check the .fla files themselves in Flash. The
person who tweaked the files may have done something to the dynamic
text fields for the button labels. If you can get a copy of Flash,
you could check two things on the button label text field
(double-click the Label object twice to get to this point):
1. See if "Use device fonts" is selected in a dropdown on the
left side of the Properties panel. This selection won't let you
embed fonts. If it's selected, try #2 below instead. If it isn't,
select it, export the movie, and put it in your output files.
2. Change "Use device fonts" to "Anti-alias for animation."
Click the Embed button. Select every option with Latin in it, and
click OK. Export to a movie, and put it in your output files.
Note that you'd have to do this for each button that isn't
displaying the characters properly.
Hope this helps,
Ben