Dear honorable reader,
when my humble self (the german speaking Tilo) talked to the signal guard Silas on his tower, he spoke in a strange foreign tongue (aka english). Actually, Silas (and only Silas) keeps talking english and ignores completely the german language setting. Of course, this could be an expression of his individuality, however, I rather suspect that the german translation of Silas is just missing or not correctly linked in the current version 7.43.
While this is obviously only a very minor issue and not relevant at all, reporting it should give you the opportunity to fix it in a coming update.