Site settings language is not properly updated when switching back to default language options

• Type: Bug
• Status: Closed
• Resolution: Fixed
• Affects Version/s: 7.0.X, 7.1.X, 7.2.X, Master
• Fix Version/s: 7.0.10.14 DXP SP14, 7.0.X, 7.1.10 DXP FP18, 7.1.10.5 SP5, 7.1.X, 7.2.10 DXP FP5, 7.2.10.2 DXP SP2, 7.2.X, 7.3.10 DXP GA1, Master
• Component/s: Portal Services > Localization, Site Settings
• Labels:
  • ee-ts
  • liferay-dxp-70-sp14
  • liferay-dxp-71-sp5
  • liferay-dxp-72-sp2
  • liferay-fixpack-de-92-7010
  • liferay-fixpack-dxp-18-7110
  • liferay-fixpack-dxp-5-7210
• Branch Version/s:
  7.2.x, 7.1.x, 7.0.x
• Backported to Branch:
  Committed
• Fix Priority: 3
• Git Pull Request: https://github.com/liferay-echo/liferay-portal/pull/209

Steps to reproduce

1. Navigate to Control Panel > Configuration > Instance Settings > Localization (Miscellaneous for 7.0)
2. Change Default Language to Japanese
3. Navigate to Liferay DXP > Configuration > Settings > Languages
4. Select "Define a custom default language and additional available languages for this site." and set Default Language to English and Save
5. Select "Use the default language options." and Save again
6. Open new browser with private mode (or clear cookies and reload the browser)
7. Access the default page as Guest

Expected result
The page is displayed as Japanese.

Actual result
The page is displayed as English.