[Vrul]

Translated with Google:

local objectiveSpecials = {
    ClickComplete = function(fontString)
        fontString:SetText("(kliknij, aby zakończyć)")    -- (click to complete)
    end,
 
    Failed = function(fontString)
        fontString:SetText("Niepowodzenie")             -- Failed
    end,
 
    QuestComplete = function(fontString)
        if fontString:GetText() == QUEST_WATCH_QUEST_READY then
            fontString:SetText("Gotowy do oddania")     -- Ready for turn-in
        else
            fontString:SetText("Zadanie zakończone")   -- Quest Complete
        end
    end,
 
    Waypoint = function(fontString, questID)
        local waypointText = C_QuestLog.GetNextWaypointText(questID)
        fontString:SetText(("0/1 %s (Opcjonalny)"):format(waypointText))    -- 0/1 %s (Optional)
    end
}
 
hooksecurefunc(QUEST_TRACKER_MODULE, "EnumQuestWatchData", function()
    for questID, block in pairs(QUEST_TRACKER_MODULE.usedBlocks.ObjectiveTrackerBlockTemplate) do
        block.HeaderText:SetText("Translated Header")
        local objectives = block.lines
        for index = 1, #objectives do
            objectives[index].Text:SetText("My translation")
        end
        for special, func in pairs(objectiveSpecials) do
            if objectives[special] then
                func(objectives[special].Text, questID)
            end
        end
    end
end)