The text above the lines isn't the translation text. Translation text
appears below the lyrics (and is inserted in the gabc between square
brackets). The style you need to play with is \greabovelinestextstyle.
Try: \renewcommand{\greabovelinestextstyle}[1]{\color{red}\greitalic{#1}}
✝✝✝✝✝✝✝✝✝✝✝✝✝✝✝✝✝✝✝✝✝✝✝✝✝
Br. Samuel, OSB
(R. Padraic Springuel)
PAX ☧ ΧΡΙΣΤΟΣ
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