Ruby2.0: remove "warning: class variable access from toplevel" in lib/plugins/rfpdf/lib/tcpdf.rb (#13338, #13329)

Contributed by Jun NAITOH.

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@11527 e93f8b46-1217-0410-a6f0-8f06a7374b81
Vietnamese translation for 2.2-stable updated by Minh Thien Nguyen (#13343, #13339)

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@11528 e93f8b46-1217-0410-a6f0-8f06a7374b81
Vietnamese translation for 2.3-stable updated by Minh Thien Nguyen (#13339)

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@11529 e93f8b46-1217-0410-a6f0-8f06a7374b81
Vietnamese translation changed by Minh Thien Nguyen (#13339)

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@11530 e93f8b46-1217-0410-a6f0-8f06a7374b81