explain that Chilling Frost does not stop dailies from hurting you - fixes https://github.com/HabitRPG/habitrpg/issues/3795

Adds the final sentence in this popup:

![screen shot 2014-07-29 at 12 58 03 pm](https://cloud.githubusercontent.com/assets/1495809/3730249/df616658-16cc-11e4-96c7-a55da1f10d2f.png)