Ahh, I see. Thanks Bjorn.
I did that to dotlrn-fs, and it indeed created the .xml file. However, after restarting the server, it still won't show the message.
I tried deleting all the message keys for that package in the lang_message_keys table, then restarting the server so it'd grab the new keys, but the key doesn't show up back in lang_message_keys.
Do I need to select "Import from the .xml file"?
-Roberto
P.S.: Is this documented somewhere so I can stop asking silly questions?