😆😃🙂 Strange question! If you ever needed such files, did you considered learning foreign languages of your interest (whatever they are)? 😉 Another solution could be to ask the producer of particular file to use a language friendly for both of you. What language are you using when have confirmed the sharing, for example? 👆 Other useful option would be usage of automatic translation tools. There are lots.
About Dropbox sync, has the file damaged somehow when synced or the only "damage" appears that you don't understand content?
Yes, it's sounding really strange in such a case. 🤔 My impression about encoding used by Dropbox text editor (seems, the one you are using here) is UTF-8. Usually used encodings are discovered automatically, but... who knows... Is the same encoding in use by text editor in use to view/edit the particular file on your laptop? 🧐 Encodings mismatch is the only thing I can think of now. Check it! What is the encoding on your laptops editor in use? Are the used encodings (if not absolutely same, which is the best case) at least same width in bytes? If not, they are absolutely incompatible.