I don't have any experience in 1.3, but you might want to search it in your group attribute..
Just create a group for each language and do something like this with the Lex tags (example based on 2.0 version tag conditionals):
{{ if {lang:name} == 'Dutch' }}
{{ navigation:links group="dutch_header" }}
{{ elseif {lang:name} == 'German' }}
{{ navigation:links group="german_header" }}
{{ elseif {lang:name} == 'Spanish' }}
{{ navigation:links group="spanish_header" }}
{{ else }}
{{ navigation:links group="english_header" }}
{{ endif }}
Now in the admin -> design navigationpage add navigation groups named "dutch_header", "german_header", "spanish_header" and "english_header".
Now just add a navigation menu to all four of the groups and each language has its own navigation.
I hope this is what you were looking for ;) GL