Available Languages setting bug in site settings

• Type: Bug
• Status: Closed
• Resolution: Fixed
• Affects Version/s: 7.0.0 DXP FP69, 7.0.X, 7.1.1 CE GA2, 7.1.10 DXP FP5, 7.1.X, Master
• Fix Version/s: 7.0.0 DXP FP75, 7.0.10.11 DXP SP11, 7.0.X, 7.1.10 DXP FP8, 7.1.10.2 SP2, 7.1.3 CE GA4, 7.1.X, Master
• Component/s: Portal Configuration > Portal Settings, Sites Administration > Sites
• Labels:
  • ee-ts
  • liferay-dxp-70-sp11
  • liferay-dxp-71-sp2
  • liferay-fixpack-de-75-7010
  • liferay-fixpack-dxp-8-7110
• Branch Version/s:
  7.1.x, 7.0.x
• Backported to Branch:
  Committed
• Story Points: 0.25
• Fix Priority: 2
• Git Pull Request: https://github.com/brianchandotcom/liferay-portal/pull/67525

Steps to reproduce:

1. Go to Configuration > Site Settings > Languages.
2. Click "Define a custom default language and additional available languages for this site."
3. In Available Languages, remove all languages from Current list to Available list.
4. Save.

Expected Result:
The settings should not be saved and should have an error: "Error: You cannot remove a language that is the current default language." like the behavior in instance settings.
Actual Result:
The settings can't be saved, success message display.