Contribution calendar week start regression
Changes done to contribution calendar in gitlab-org/gitlab-ce!3944 (v8.9) result in top row displaying contributions made on Sundays, whereas since introduction of this feature in gitlab-org/gitlab-ce!306 it showed Monday's contributions.
For international folks it is awkward to see weeks beginning on Sundays. Sure, it's probably reverse for U.S. people
"Cal-HeatMap" by default has weekStartOnMonday option set to true
Since it wasn't (AFAIK?) anticipated change, easiest approach would be to modify code to shift Sunday to the bottom.
In longer term, this could probably be made into a user preference.