I can't seem to get it working with either file, although I'm probably just implementing the strings incorrectly. I'm copying the file to the override folder and using SAY [offset] [string]. After installation I view the edited file in NI and see the strings there, but they don't appear in the game.
Well, I would use this:
SAY MORALE ~Sticking around is only going to get us killed.~
SAY HAPPY ~This group is great~
SAY UNHAPPY_ANNOYED ~You're starting to take the wrong path in morals.~
SAY UNHAPPY_SERIOUS ~I'll leave if you don?t stop!~
SAY UNHAPPY_BREAKING ~You suck, I'm outta here.~
SAY LEADER ~Yay I'm the leader!~
SAY TIRED ~I'm tired.~
SAY BORED ~I'm bored.~
SAY BATTLE_CRY1 ~TO BATTLE!~
SAY BATTLE_CRY2 ~Time to die!~
SAY BATTLE_CRY3 ~DIE NOW!~
SAY BATTLE_CRY4 ~DIE!~
SAY DAMAGE ~Ow!~
SAY DYING ~AH!~
SAY HURT ~Help me!~
SAY AREA_FOREST ~We're in a forest.~
SAY AREA_CITY ~We're in a city~
SAY AREA_DUNGEON ~We're in a dungeon.~
SAY AREA_DAY ~It's day.~
SAY AREA_NIGHT ~It's dark.~
SAY SELECT_COMMON1 ~Yeah?~
SAY SELECT_COMMON2 ~What do you need?~
SAY SELECT_COMMON3 ~Grunt.~
SAY SELECT_COMMON4 ~What?~
SAY SELECT_COMMON5 ~Yes?~
SAY SELECT_COMMON6 ~I'm listening.~
SAY SELECT_ACTION1 ~Uh huh.~
SAY SELECT_ACTION2 ~Sure.~
SAY SELECT_ACTION3 ~I'm on it.~
SAY SELECT_ACTION4 ~YAY!~
SAY SELECT_ACTION5 ~Not hard at all~
SAY SELECT_ACTION6 ~Yep~
SAY SELECT_ACTION7 ~Okay~
SAY SELECT_RARE1 ~I'm ready.~
SAY SELECT_RARE2 ~I got it.~
SAY CRITICAL_HIT ~Yeah!~
SAY CRITICAL_MISS ~Damn!~
SAY TARGET_IMMUNE ~No effect?~
SAY INVENTORY_FULL ~It's too heavy!~
And then if you wish to attach the sound files too, use the [].wav like this:
SAY MORALE ~Sticking around is only going to get us killed.~ [sound file name, 8 chars max, and no .wav extension]
Of course, the strings are probably overwritten when one chooses the sound in the character creation, but you can always trick it by removing the appropriate sound files from the sounds directory.

As you put them to the override...
Erhm.... you might wish to look at your charsnd.2da file(
default), as it should modify the subtitles that are used with the sound files.
Edited by Jarno Mikkola, 11 September 2009 - 01:56 AM.