If your translation file was incorrectly translated (ie. they replaced the lines rather than inserting the translation in between), you can try this utility:
http://www.adventuregamestudio.co.uk/fixtrans.exe
which attempts to fix it -- however you will need a copy of the original translation source that you sent to your translator in order for this to work.
Note this utility is completely unsupported, use at your own risk.