Translatable or configurable Strings

Taken out of this issue: http://drupal.org/node/721668#comment-3932634

I needed to translate the "Under Construction" String, so I simply hacked the function menu_editor_under_construction() in menu_editor_node_creation.module like this:

  // Make the "Under Construction"-String translatable
  $underconstruction_title = t('Under Construction');
  drupal_set_title("$item[link_title] - $underconstruction_title");

Maybe something like this could make it into the next release?

donquixote further asked, if it's sufficient to make strings translatable or if they should also be customizable.
Personally, I am fine with being able to translate them.