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 four Hebrew letters of God's personal name, YHWH. Most English translations render it “the LORD” in small capitals, following the Jewish practice of not pronouncing it.
In Scripture — The canon, translation, and how Lutherans read the Bible.