There is a sortkey element (which also contains a format string) which decides on the order of your sources in a bibliography.
Sorting by language is tricky. In Word 2007, you could enter your language through the UI. However Microsoft removed that option in Word 2010 and later version. Mostly because it was too complex for users to use: users frequently reported that their bibliography contained multiple languages without understanding why.
You are going to have to do some experimentation to see if you can get things to work the way you want.