This table basically handles 3 quest details:
Emote (from Emotes.dbc) played by the quest ender NPC when all quest objectives are completed.
Emote (from Emotes.dbc) played by the quest ender NPC if any of the quest objectives are incomplete.
Quest gossip text shown in the final gossip dialogue window when turning in an item delivery quest.
The quest item(s) involved in the quest can either be provided by the quest giver or collected by the player.
This field is used by the TrinityDB Team to determine whether a template has been verified from WDB files.
If value is 0 then it has not been parsed yet.
If value is above 0 then it has been parsed with WDB files from that specific client build.
If value is -1 then it is just a place holder until proper data are found on WDBs.
If value is -Client Build then it was parsed with WDB files from that specific client build and manually edited later for some special necessity.