The order of confirmation of destructive actions on Redmine is less than ideal:

text_project_destroy_confirmation: Are you sure you want to delete this project and related data?
text_wiki_destroy_confirmation: Are you sure you want to delete this wiki and all its content?
text_issues_destroy_confirmation: 'Are you sure you want to delete the selected issue(s)?'
text_time_entries_destroy_confirmation: 'Are you sure you want to delete the selected time entr(y/ies)?'
text_own_membership_delete_confirmation: "You are about to remove some or all of your permissions and may no longer be able to edit this project after that.\nAre you sure you want to continue?"
text_account_destroy_confirmation: "Are you sure you want to proceed?\nYour account will be permanently deleted, with no way to reactivate it."

Long introductions get in the way of good communication. The average user just reads half of the text message, up to "Are you sure you want to delete...". The most important part of the message is what the action is actually doing.

My suggestion is to change the order of confirmation messages as such:

"Delete this project and related data. Are you sure?"