fixed bug when can't get env['HTTP_ACCEPT_LANGUAGE'].
fixed bug when can't get env['HTTP_ACCEPT_LANGUAGE'].

takaokouji/smalruby-editor,takaokouji/smalruby-editor,Ikuyadeu/smalruby-editor,smalruby/smalruby-editor,takaokouji/smalruby-editor,smalruby/smalruby-editor,Ikuyadeu/smalruby-editor,smalruby/smalruby-editor,Ikuyadeu/smalruby-editor