Were using old entity naming scheme (*.ss) instead
of underscored version which doesn't create a new YML
namespace. This means all existing translations should indeed be used.
Was already fixed in master, but not in 3.1
Was inferred by the containing file previously,
which is deprecated behaviour, because it obscures
the fact that renaming an template file or copying
template code will change the context of the translations.
While it would be nice to use shorter and more readable namespaces,
this change would remove all existing translations.
Since there is no (easy) migration of entities to a new namespace,
having verbose template code is the lesser of two evils.
