The popular issues link is not working in Getting Involved and Roadmap pages. The attached patch removes both mentions.
Looks like it was available for JIRA 6.1 users, but was removed in 6.2 (https://confluence.atlassian.com/display/JIRA/JIRA+6.2+Upgrade+Notes#JIRA6.2UpgradeNotes-LabelsandPopularIssuestabsremovedfromProjectOverview). We use the 6.3 if I'm not mistaken at ASF.
Hope that helps