PartyToGo is, more or less, the Party Notify and Announce modules of QuestsFu, packaged separately.
It can display announcements locally when other people running an addon that embeds Quixote (QuestsFu, Cartographer_Quests, nQuestLog, probably others) advance in a quest.
It can also say something in party chat when you advance in a quest. This is disabled by default, because some people might find it annoying.
52528: Use SinkLib to provide many options for where to put the output. More flexible options for what to say and when to say it.
44260: Remove a broken localization string.