If you open the "dictionary Voice", or "lang voice" file with Winrar you can then extract the i18 file, then close the lang[voice] and edit them externally without affecting the original.

Once you have corected the files you can then open the originals again. Delete the i18 file and add back the editted versions.

If you save a copy of the downloaded i18 files you can the re load them if you spoil the insitu fles