To follow up, I replicated your System Language settings, but could not duplicate the issue with loading the tools in Word.
In case there is an issue with the “EndNote CWYW Word 2011.bundle” file on your system, you can try downloading a replacement for those tools. To do that you can download and install the latest EndNote Cite While Write Installer here. Once that has downloaded, Quit Word and run that file to see if it replaces the tools.