Google translate is a very useful tool to know what a text is about, but this tool must be used in a responsable way. While it saves translators time, as most users do not bother contacting translators for menial tasks, it is important to have in mind that it only gives you an idea of what a text is about. Do not use this tool to publish any serious information, or to contact important business contacts, as you will probably be let down.
It has been known that people feeding into the Google Translate system entered errors, by mistake and in some cases, or as a blatant case to disrupt the service.
Legal and sensitive translations always need to be right, and in such cases a professional service can help you out.