Are people still willing to help translate it? We could get a couple of guys together and offer to do it. If we message their Facebook page it much more likely to get a response than on here. I'll join in, but I'd rather have a couple more with me, as I'm working and doing a masters degree at the same time And there is quite a lot of text. I could coordinate it though. You'll need at least a basic understanding of German, as google translate just doesn't cut it most of the time. You'll also need to know some fire fighting related technical terms in German, as a poor understanding of these can easily "break" a translation. And of course decent English written skills.
Could probably do most of it on google docs, at least the .lang files. The images are another matter, we'd probably need the raw Photoshop files, or whatever other program they used.
Post here or shoot me a PM, or both, if you'd be willing to pitch in. I'll contact them on Facebook once we have a couple of people.