Correct plugin configuration

The plugin configuration option was not properly defined and did not appear in the
administration panel.

Signed-off-by: Cilyan Olowen <gaknar@gmail.com>
Correct javascript localisation

The namespace for javascript localisation was not properly setup, thus no string was
accessible from client side script.

Signed-off-by: Cilyan Olowen <gaknar@gmail.com>