[2007/01/18 03:05:35-186-x1]: Cartographer_Vendors-0.1\addon.lua:6304: AceLocale(Cartographer_Vendors): Translation "Fishing Trainer" does not exist.
there are more of these around, for example the blacksmithing trainer in thrallmar give the same type of error
Please try the newest version in SVN. I've changed it so that it will only localize the display, not the saving. It should also show you the english text if it can't find a version for your language.
Unfortunately I can't test it, only have enUS client, so any feedback you can provide will be much appreciated. :)