I have introduced a TranslationDictionary in the wiki. It should provide a help for you to translate frequently used words of Widelands (names of wares, workers, buildings and other words) in a consistent way.
For each language, there should be a Wiki page linked to this main page. I created the German and French one.
The dictionary consists of tables, where you can look up frequently used words, so that e.g. a certain building has always the same translation.
Of course, the tables have to be filled first in a wiki style That's some boring secretary work first, but I hope it helps to ameliorate the future translations.