Office Web Apps has a setting to enable translation services for Word documents. Reference MSDN blog: http://blogs.msdn.com/b/alimaz/archive/2012/07/26/translating-office-documents-using-office-web-apps-preview-and-microsoft-translator-service.aspx
By default the "TranslationEnabled" setting = False. Unfortunately, if you do NOT want the Translate option to appear in the Word Web App >> File >> Info options, you need to take an extra step.
How to Disable Translation in Word Web App
There is an .ini file in the root Office Web Apps Server directory (\Program Files\Microsoft Office Web Apps\WebWordViewer) called Settings_service.ini. Open that .ini in Notepad and edit this line:
; The switch to turn the word viewer translation feature on/off in the datacenter
WordViewerTranslationIsEnabled=(System.Boolean)True
to this instead:
WordViewerTranslationIsEnabled=(System.Boolean)False
Afterwards, restart the Office Web Apps service via Powershell: Restart-service wacsm
Result:
The Word Web App will no longer provide the option to translate the document.