Like in the summary
Fixed in trunk build: http://wl.widelands.org/wiki/DownloadPage/#unofficial_development_builds
Translations in Widelands are open, and anyone can suggest new translations here (https://translations.launchpad.net/widelands/trunk/+lang/de). I'm not sure what the word is but it looks like the name of a building.
Post #4 at https://answers.launchpad.net/widelands/+question/149790 might give you some hint where to find it.
Released in build17-rc1.
Bug watches keep track of this bug in other bug trackers.
Fixed in trunk build: http:// wl.widelands. org/wiki/ DownloadPage/ #unofficial_ development_ builds