Removed unnecessary icon file from release packaging.
Fixed the legacy parser placeholder substitutions for script extenders..
Issue #20 work.

All strings that go to the UI, excluding masterlist message content and
strings in thrown exceptions are not translatable.

With the logging support we have, there's no reason why exception
strings shouldn't also be translated, they just need to have equivalent
logging statements just before the throw, so this overlaps with issue
#11.

Need to also take a look at the message throw chains, because I'm pretty
sure some of the non-detail stuff gets repeated at each level.