I made a canvas application with a personalized calendar with the weekdays in French.
Everything is fine, except that since today when the user launches the application the date is in English format. in edit mode, the date format works correctly.
Did you have this problem ?
I use PowerApps in several companies (in Sweden) and all apps are suddenly defaulting to US locale/date format.
So this is most likely a general change done by Microsoft in the background...
Not a solution, but just confirming your finding and that the problem is widespread.
same issue here in Austria and Germany - date format suddenly in US-format... additionally: text-fields with input-type "number" now also in US-Format (. instead of , for a semidigit)