Returns a localised string describing the given element, for use in error dialogs or other messages to be seen by the user.
This function is mainly for internal use, applications would typically use missing_plugin_message_get_description to get a description of a missing feature from a missing-plugin message.
the name of the element, e.g. "giosrc"
a newly-allocated description string. Free string with g_free when not needed any longer.