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          after_detection_hook => sub {
              my($c, $lang) = shift;
              return 'zh-cn' if $lang eq 'zh'; # use zh-cn.po file
              return $lang;
          },
      });

  for your CLI
      __PACKAGE__->load_plugins('L10N' => {
          default_lang          => 'ja',
          accept_langs          => [qw/ en ja /],
          before_detection_hook => sub {
              my $c = shift;
              return unless $NEV{CLI_MODE}; # CLI_MODE is example key
              return 'ja' if $ENV{LANG} =~ /ja/i;
              return 'en' if $ENV{LANG} =~ /en/i;
              return; # use default lang
          },
      });

  you can set Locale::Maketext::Lexicon options
      # in your MyApp.pm
      __PACKAGE__->load_plugins('L10N' => {
          accept_langs   => [qw/ ja /],
          lexicon_options => {
              _auto => 0,
          },
      });

  you can implement L10N class yourself
      package L10N;
      use strict;
      use warnings;
      use parent 'Locale::Maketext';
      use File::Spec;
  
      use Locale::Maketext::Lexicon +{
          'ja'     => [ Gettext => File::Spec->catfile('t', 'po', 'ja.po') ],
          _preload => 1,
          _style   => 'gettext',
          _decode  => 1,
      };
  
      # in your MyApp.pm
      __PACKAGE__->load_plugins('L10N' => {
          accept_langs => [qw/ ja /],
          l10n_class   => 'L10N',
      });

Translation Step
  installing dependent module of amon2-xgettext.pl
      $ cpanm --with-suggests Amon2::Plugin::L10N

    dependnt module list in the cpanfile file.

  write your application
  run amon2-xgettext.pl
      $ cd your_amon2_proj_base_dir
      $ perl amon2-xgettext.pl en ja fr zh-tw

  edit .po files
      $ vim po/ja.po
      $ vim po/zh-tw.po

Add Amon2 Context Method
  $c->l10n_language_detection
    Language that is detected will return.

  $c->loc($message), $c->loc('foo %1 .. %2 ...', @args);
    It will return the text in the appropriate language.

AUTHOR
    Kazuhiro Osawa <yappo {at} shibuya {dot} pl>

COPYRIGHT
    Copyright 2013- Kazuhiro Osawa

LICENSE
    This library is free software; you can redistribute it and/or modify it
    under the same terms as Perl itself.

SEE ALSO
    Amon2, Locale::Maketext::Lexicon, HTTP::AcceptLanguage,
    amon2-xgettext.pl