Here is a sample transcription from another folio of the Luttrell Psalter.
D..........Ominus regnauit exultet
...............
terra : letentur insule multe.
Nubes et caligo in
circuitu eius : ius
ticia et iudicium correccio sedis eius .
Translation from the Douai translation of the Bible:
The Lord hath reigned, let the earth rejoice: let many islands be glad.
Clouds and darkness are round about him: justice
and judgement are the establishment of his throne.