Hey Boriss, here is the promissed spread sheet:
www.file-upload.net/download-13333920/EN.xlsx.html
Please start with the marked ones (blue) as they are very important for the Pegasus Prelude GC, then you can also improve other texts such as the ones with _DESCRIPTION_ in name. Please mark the line with the finished text in green so I see what is done and what still need to be improved. Once you think you have a sufficient amount of progress, you can upload it here or send it to me via PM.
Btw. of course, if there are other volunteers feel free to download this spread sheet too and help us improving together.