Utilizing Google's Language Translator, you can allow your users to be able to set their own Reach desktop browser language preferences.

To manage the permission settings to enable this ability, either update Base Security Permissions in System Configurations > Infinity or by individual user's Permission settings in People Management > View Contacts in the user's Contact Details.  The permission is found in the Features section, "Access the Language Translator Selector (16-123. VIS_LANG_TRANS)"