Merge branch 'security-11-6-54377-label-milestone-name-xss' into 'security-11-6'
[11.6] Escape label and milestone titles to prevent XSS in GFM autocomplete See merge request gitlab/gitlabhq!2740
[11.6] Escape label and milestone titles to prevent XSS in GFM autocomplete See merge request gitlab/gitlabhq!2740