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{"responseData":{"translatedText":"Ciao mondo"},"responseDetails":"","
+responseStatus":200,"matches":[{"id":"424913311","segment":"Hello Wor
+ld","translation":"Ciao mondo","quality":"74","reference":"","usage-c
+ount":50,"subject":"All","created-by":"","last-updated-by":null,"crea
+te-date":"2011-12-29 19:14:22","last-update-date":"2011-12-29 19:14:2
+2","match":1},{"id":"0","segment":"Hello World","translation":"Ciao a
+ tutti","quality":"70","reference":"Machine Translation provided by G
+oogle, Microsoft, Worldlingo or the MyMemory customized engine.","usa
+ge-count":1,"subject":"All","created-by":"MT!","last-updated-by":null
+,"create-date":"2012-05-13","last-update-date":"2012-05-13","match":0
+.85}]}

use JSON qw( decode_json );     # From CPAN
use Data::Dumper
...
        foreach my $value ( @{ $decoded_json->{'responseData'} } ) {
        print my $value->{'translatedText'} ;
}