Range-diff !527

back to !527 Reactions on issues, merge requests and comments

1:  a690885 = 1:  67d2c52 Add reactions to issues, merge requests and comments
2:  aea4d28 = 2:  a75d048 Web: reaction buttons under issue and merge request bodies and comments
3:  62ae5b4 = 3:  f7e43e4 Reactions: e2e test, Parity, Users, changelog