I threw out a suggestion to the Perl 6 people that Perl have pluggable parsers that can be swapped, allowing you to have a Swedish version of Perl but still use standard Perl modules. I don't think people liked the idea that much.

But a better first language is probably Smalltalk, recommended by the likes of merlyn at RE: Perl as a first language. And I have been told that that is also available in language specific versions. I don't know whether a Swedish version exists, but if it doesn't it should not be that hard to produce one.