Englishnames.cfg controls how they appear in the Recognition Manual. Without it, the Manual will identify them as M24B etc. With PvtGodfrey's version the ships will all be identified as Medium Merchant, Tanker, and so on.
You can also try my version, which assigns class names so they look like real ship types. Of course it also helps if you use my Ship Names mod, which gives historical names to each ship you sink.
http://www.subsim.com/radioroom/down...o=file&id=4671