On: every psalm and song in the daily prayers uses today’s English. Off: all of them use the older “thee and thou”. Until you choose, the Songs of Zechariah, Mary and Simeon use today’s English, as most churches sing them. The Lord’s Prayer and the prayers for the dying show the form most people learned.
The list of books the church receives as Scripture. Lutherans receive the sixty-six books of the Hebrew Bible and New Testament, and treat the Apocrypha as useful and good to read but not the basis of doctrine.
In Scripture — The canon, translation, and how Lutherans read the Bible.