Token Support.

This needs work. We need to recognise tokens that can be present in string and provide replacements while it is rendered. This maybe already taken care by the translation system, we need to check that.

Not going to pursue this any further for now. Token support needs the parameter to be injected in the source as follows,

Ref: https://www.drupal.org/documentation/modules/token →

$node = node_load(10);
$message = token_replace($unprocessed_message, array('node' => $node))

This goes against the DX planned for the module where the format on how the strings are consumed in source code shouldn't change much.