Wrong calendar display in Identify for non-English languages

Platform: Website

Browser: various

URLs: https://www.inaturalist.org/observations/identify

Screenshots of what you are seeing:

Description of problem:

Step 1: select a non-English language (I tried it for German and Spanish)

Step 2: go to Identify view

Step 3: filter for exact date

Result: the calendar shows non-existing dates (shift by one day) and the weekday abbreviations are not translated

Could this be due to different definitions of the ‘first day of the week’ (Sunday vs. Monday)?


Possibly related to this bug, so I am adding it here:
In the German layout, the dates are now translated, but still shifted by one day - however, only (as far as I could see) when selecting dates during creation/editing of collection projects:

(correct would be >>Di 14<<)

On any other parts of iNaturalist, and also in the (Android-)app, weekdays are correctly assigned.

Calendar (inaturalist.org/calendar/USERNAME): :white_check_mark:

Editing observation: :white_check_mark:

Filter in Explore: :white_check_mark:

Filter in ID-Module: :white_check_mark: