The first part of a line in the text.csv tells the game which string this is, so it can then select the right string to display. The game is looking for OL_UNIT_MOVING but it isn't there. So either the string is marked wrong int he text.csv or the string is missing. Either way it should be a trival fix, so I'll log it with a programmer and well get it on the list of things to do for 1.2.