Open WhisperCast.lua

Find

        {
            spell = WCLocale.DRUID.Abolish_Poison,
            trigger = "rejuv",
            level = 26,
	    cooldowncheck = 0,
            combat = true
        },

Add BELOW

        {
            spell = "Rejuvenation",
            trigger = "rejuv",
            level = 26,
	    cooldowncheck = 0,
            combat = true
        },


Save and /console reloadui