Ok well, thanks for your answer. So i belive my first guess was not that bad. I thought about the TranslatedStringKey tool because i also found that Signposts.lsb But now there's another problem which i have to fix first. When i tried to use that editor my D:OS EE engine always crashed. I just thought, well ok just a tool that is broken, so it wont have anything to do with it. But it looks like i was wrong and it's a very important tool. Guess i'll need to get that to work :S
You can always create such a file manually, unpack it, rename it, change the contents of the XML and repack it as LSB. Don't forget to remove the 'handle="..."' part.
You need Norbyte's extractor to do all that.
There might be people who know why the engine crashes on this editor ... and maybe only on this one. You could try to remove any files you have in Mods\...\Localization and Public\...\Localization which might be corrupted.