Redmine

roadmap overview raises ArgumentError: incomplete format specifier on ruby 2.5 dev

as suggested on https://bugs.ruby-lang.org/issues/13761 it should be prepended with another '%'

'%0.0f%' % 45 - wrong
'%0.0f%%' % 45 - correct

patch included

Environment:
  Redmine version                3.4.1.stable
  Ruby version                   2.5.0-p-1 (2017-07-21) [x86_64-linux]
  Rails version                  4.2.9
  Environment                    production
  Database adapter               PostgreSQL
SCM:
  Git                            2.13.0
  Filesystem