hook(type => "filter", id => "po", call => \&filter);
hook(type => "preprocess", id => "translatable", call => \&preprocess_translatable);
hook(type => "htmlize", id => "po", call => \&htmlize);
hook(type => "filter", id => "po", call => \&filter);
hook(type => "preprocess", id => "translatable", call => \&preprocess_translatable);
hook(type => "htmlize", id => "po", call => \&htmlize);