I suspect that "The Dreibund" event title and description becomes "The Death of King George V" because the game first reads EVT_300_NAME and EVT_300_DESC (corresponding to the Dreibund) from event_txt in config folder of mod1914, then reads EVT_300_NAME and EVT_300_DESC (corresponding to King George) from new_text file in config folder of vanilla DH, thus overwriting the former.
Maybe adding a blank new_text file in config folder of mod1914 could fix this issue?