Currently, the only notifications shown to mobile users (of the website) are the ones from CentralNotice, which are not always appropriate for mobile screens. We should have a way to display notifications to mobile users that are:
- configurable from the wikis
- configurable per period, signed/anon users, geolocated
- appropriate for small screens (not sure what that would mean exactly, but I'm thinking: fixed-size images, hard limit on the number of characters, no flashy borders etc)