Added some comments to make the flow easier to follow, and
removed an annoying 'success' variabled in favor of a for / else
loop statement.

This was sitting in the section for abstract methods, but this
is most definitely not an abstract method to be implemented by
Sources.

This was displaying the aliased URL which is pretty useless,
use the translated URL for the timed activity.

Minor code changes revolving around source mirroring

See merge request !759