Adds descriptions for mythic keystone properties to their tooltips so you don't have to remember what they all mean.

Here's a list of dungeon modifiers and their descriptions:

• Overflowing - Healing in excess of a target's maximum health is instead converted to a heal absorption effect.
• Skittish - Enemies pay far less attention to threat generated by tanks.
• Volcanic - While in combat, enemies periodically cause gouts of flame to erupt beneath the feet of distant players.
• Necrotic - All enemies' melee attacks apply a stacking blight that inflicts damage over time and reduces healing received.
• Teeming - Additional non-boss enemies are present throughout the dungeon.
• Raging - Non-boss enemies enrage at 30% health remaining, dealing 100% increased damage until defeated.
• Bolstering - When any non-boss enemy dies, its death cry empowers nearby allies, increasing their maximum health and damage by 20%.
• Sanguine - When slain, non-boss enemies leave behind a lingering pool of ichor that heals their allies and damages players.
• Tyrannical - Boss enemies have 40% more health and inflict up to 15% increased damage.
• Fortified - Non-boss enemies have 20% more health and inflict up to 30% increased damage.
• Bursting - When slain, non-boss enemies explode, causing all players to suffer 10% of their max health in damage over 4 sec. This effect stacks.
• Grievous - When injured below 90% health, players will suffer increasing damage over time until healed above 90% health.
• Explosive - While in combat, enemies periodically summon Explosive Orbs that will detonate if not destroyed.
• Quaking - Periodically, all players emit a shockwave, inflicting damage and interrupting nearby allies.
• Relentless - Non-boss enemies are granted temporary immunity to Loss of Control effects.