atkcomponent: deprecate get_position and get_size

You get the same information from get_extents. In fact,
default implementation for those methods on atk were using
get_extents.
atkcomponent: document that ->contains already have a default implementation
Updated Indonesian translation
Updated Aragonese translation
Updated Norwegian bokmål translation
atkcomponent: more info on the deprecation guards for get_size and get_position