Datepicker first day of week is Sunday for the en_GB locale, when rendered by DDM Date field

• Type: Bug
• Status: Closed
• Resolution: Fixed
• Affects Version/s: 7.2.X, 7.3.X, Master
• Fix Version/s: 7.2.10 DXP FP15, 7.2.X, 7.3.10.3 DXP SP3, 7.3.X, 7.4.1 CE GA2, 7.4.2 CE GA3, 7.4.13 DXP GA1, Master
• Component/s: Dynamic Data Lists
• Labels:
  • ee-ts
  • liferay-dxp-73-sp3
  • liferay-fix-pack-dxp-3-7310
  • liferay-fixpack-dxp-15-7210
  • liferay-fixpack-dxp-3-7310
• Branch Version/s:
  7.3.x, 7.2.x
• Backported to Branch:
  Committed
• Fix Priority: 3
• Git Pull Request: https://github.com/liferay-data-engine/liferay-portal/pull/453

Steps to reproduce:
1. In Instance Settings/Localization add English (UK) as a current locale.
2. Set the current user's profile language to English (UK) - in Account Settings. This means that whenever this user is presented with a date picker, he should see Monday as the first day of the week (see https://en.wikipedia.org/wiki/Week and
http://chartsbin.com/view/41671)
3. Go to Dynamic Data Lists and create a new data definition with a Date field.
4. Create a list based on this definition and start adding a new record to it.
5. Click on the date field.
Result: Sunday is the first day.
Expected: Monday should be the first day. (If at step 2 you would have set user's language to French, you would have Monday-Lundi as the first day, correctly)