Rails4: add ApplicationHelper#truncate_single_line_raw method replacing truncate_single_line

git-svn-id: http://svn.redmine.org/redmine/trunk@12830 e93f8b46-1217-0410-a6f0-8f06a7374b81
Rails4: replace ActionView::Helpers::TextHelper#truncate by String#truncate at ApplicationHelper#link_to_issue

git-svn-id: http://svn.redmine.org/redmine/trunk@12831 e93f8b46-1217-0410-a6f0-8f06a7374b81
Rails4: replace ActionView::Helpers::TextHelper#truncate by String#truncate at lib/redmine/export/pdf.rb

git-svn-id: http://svn.redmine.org/redmine/trunk@12832 e93f8b46-1217-0410-a6f0-8f06a7374b81
Rails4: replace ActionView::Helpers::TextHelper#truncate by String#truncate at ApplicationHelper#parse_redmine_links

git-svn-id: http://svn.redmine.org/redmine/trunk@12833 e93f8b46-1217-0410-a6f0-8f06a7374b81
Rails4: replace ActionView::Helpers::TextHelper#truncate by String#truncate at ApplicationHelper#link_to_message

git-svn-id: http://svn.redmine.org/redmine/trunk@12834 e93f8b46-1217-0410-a6f0-8f06a7374b81