coordinates inconsistencies after bugfix
I just noticed that fixing #828 (closed) created DB inconsistencies.
All events created before the coordinates bugfix should be updated because now they have lat/long inverted.
Check this event for example: https://mobilizon.fr/events/23974ad4-aff8-4517-9008-491123aa77ed
The location is in the ocean, near Somalia (3.531047,50.3560257), which is what you obtain when you invert the coordinates of Boulevard Watteau (50.3560257,3.531047).