Pull Request title "Communication: Change posting deletion logic to not abort when deconstructing a post " failed to pass match regexp - /^`(Programming exercises|Integrated code lifecycle|Quiz exercises|Modeling exercises|Text exercises|File upload exercises|Exam mode|Grading|Assessment|Communication|Notifications|Team exercises|Lectures|Integrated markdown editor|Plagiarism checks|Learning analytics|Adaptive learning|Learning path|Tutorial groups|Iris|Scalability|Usability|Performance|Infrastructure|Mobile apps|Development|General)`:\s[A-Z].*$/