I was following the localizing tutorial, but when I tried to munge it I got this error PC_MungeLog: After I tried checking ingame, nothing was localized. Any help?

That's strange. It sounds like maybe something went wrong when you saved the localization changes in the Multi Language Tool (probably not your fault unless you canceled the save process somehow). Try looking through all the language .cfg's in Notepad++. Make sure all the braces and parentheses are closed properly. Check for data corruption at the end of the files. If you can't find anything useful to work with, you'll need to start the localizing from scratch. You can just copy the contents of BF2_Modtools/data/common/Localize into data_ABC/common/Localize and overwrite everything, then do a full manual clean and full munge and start your localizing from the beginning.