with this commit we changes field names for week days like su, mo, tu etc. to
sun, mon, tue and so on in calendar module, this is going to be used in
task 2317795 where we developed recurrency module for recurrency mixin.
Also with this commit we change field names of weekdays in lunch module to have
same name as we have in calendar and project module so that we can easily use
custom widget "web_weekly_recurrence" instead of defining boolean field in xml
for each day.
task-2335399
Co-authored-by: Mohammed Shekha <msh@odoo.com>
