Basically, you should be able to download the machine translated subtitles from the link above (I believe it's an SRT file compressed in a ZIP folder, which you can extract and then open with Notepad). The subtitle file is formatted like this:

line number

timecode for start and end of that line hh:mm:sec,msec --> hh:mm:sec,msec

actual text

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so for example, the first item in my file is

1

00:01:22,500 --> 00:01:30,000

Mother

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Now, let's say this line has been mis-translated - it says Mother when it should really say Father (silly example, I know). You can leave the first 2 lines untouched (the line number and timecodes) and only edit the 3rd line (the text), then save. When playing the finished file, the first 2 lines will not be visible (the are sort of background code), only the text is.

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This process will of course require you to have access to the movie. Or at least for you to have seen it once and have a great memory for the dialogue :D