Below are links to transcripts for all the scenes in which Zalbag appears as a character. Each provides text in the original Japanese as well as for all available translations (both official and fan made) that I have found for the game.
death of father balbanes
at igros castle
attack by the death corps!
battle: fort zeakden
reunion with zalbag
assassination of prince larg!
mosfungus
battle: igros castle
battle: chapel of st. murond temple