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use strict; # =)

...
            'Italian'=> ['gennaio', 'febbraio', ...],
        #etc ...
        );

# $language is set at run time and would be one of 'English', 
# 'Italian' etc. -- the keys of your $months hash
# also assumes $month_number ranges from 1 to 12; if it's 0 to 11, eli
+minate the '-1'

my $month_name = $month{$language}[$month_number-1];