I used the Codestyling localization plugin, thanks for the hint!
This isn’t a very convenient way to deal with elements you don’t want to appear. For pages you can use this php code in the php file(s) where you want the comments to disappear:
if (!is_single(array(123,345,456))) {echo do_shortcode('[fbcomments]');}
Replace the IDs 123,345,456 with the ones that you want to hide.
For posts use:
if (is_single(array(123,345,456))) {echo do_shortcode('[fbcomments]');}
Hope that helps!