This is a bug in the OS X Terminal app that only shows up in certain locales (country/language combinations). Open Terminal in /Applications/Utilities and uncheck the box “Set locale environment variables on startup”.
This will set your LANG environment variable to be empty. This may cause terminal use to incorrect settings for your locale. The locale command in the Terminal will tell you what settings are used. To use the correct language, add a line to your bash profile (typically ~/.profile)
export LANG=your-lang
Replace your-lang with the correct locale specifier for your language. The command locale -a will show you all the specifiers. For example, the language code for US English is en_US.UTF-8. The locale affects what translations are used when they are available, and also how dates, currencies, and decimals are formatted.
Note, this image and content were taken from http://conda.pydata.org/docs/troubleshooting.html#unknown-locale (I'm also the original author of that page).
