To fix the scope of the  variable defined in the lib/tcpdf/lang/*.php files the file needs to be included not using module_load_include so that the language array defined stays in accessible scope.
Changed back and pulled in the variable using global .
Ignore coding standards.
Removed set language array
Merge pull request #141 from matthewperry/7.x-INT-433

To fix the scope of the  variable defined in the lib/tcpdf/lang/*.php ...