That helps. It's something related to your language file. It could be a few things.
If it's doing this for everyone, then it could be:
1) The default language in your config file isn't set properly. Make sure this is set to something like 'english'.
or
2) Permissions on your language directores, make sure they are still set to 775 or 777 for directories and the files within something like 664 or 666.
If it's only happening to you then it would be related to your personal language setting in the database. So you'd want to check the U_Language field in the w3t_Users table to make sure it's set to something like 'english' for you.