Here is the Latin refrain, followed by a word-for-word English translation, and then the metered translation found in Lutheran Service Book.
Rex Christe, Redemptor,
Cui puerile decus
prompsit hosanna pium
Glory, praise and honor to you,
who is Christ the King [and] Redeemer
In whom childlike dignity
brings forth the godly hosanna
All glory, laud, and honor
To You, Redeemer, King
To Whom the lips of children
Made sweet Hosannas ring.
Choir, Handbells, Solo Instrument
Michel Chapuis Organ Improvisation
Schuebler Chorale arranged for Foot, Hand and Coronet
Contemporary Arrangement (different tune)