You can use Contact Form 7 admin screen in your language. Because it follows WordPress’s language setting, all you need to do is select your preferred language from the Site Language drop-down menu in the admin menu Settings > General.
When you have multiple users on your site and each user has a different preferred language, multilingual plugin like Bogo will be a great help.
You can generate a contact form template in the language in the Contact > Add New menu.
If you are interested in translating Contact Form 7 itself, see Translating Contact Form 7.