Cannot delete language from instance settings

• Type: Bug
• Status: Closed
• Resolution: Fixed
• Affects Version/s: 7.0.X, 7.1.X, Master
• Fix Version/s: 7.0.0 DXP FP69, 7.0.X, 7.1.10 DXP FP5, 7.1.10.1 SP1, 7.1.2 CE GA3, 7.1.X, Master
• Component/s: Portal Configuration > Portal Settings, Portal Services > Localization
• Labels:
  • QA-AUTOMATION
  • ee-ts
  • liferay-dxp-70-sp10
  • liferay-dxp-71-sp1
  • liferay-fixpack-de-69-7010
  • liferay-fixpack-dxp-5-7110
• Branch Version/s:
  7.1.x, 7.0.x
• Backported to Branch:
  Committed
• Fix Priority: 3
• Git Pull Request: https://github.com/brianchandotcom/liferay-portal/pull/64934
• QA Test Name:
  • LocalFile.SitelocalizationUsecase#AvailableSiteLocalesSubsetNotAllowed
• QA Test Score: 5

Steps to reproduce:

1. Start the portal with a 'clean' database.
2. Create a new site Site1.
3. From Site1's Settings, configure a default custom language, for example Spanish.
4. Go to Control Panel -> Instance Settings -> Miscellaneous and remove Portuguese from the list of Current Languages.

Expected result : Portuguese is removed succesfully, since no site has it configured as default language.

Current result : it is not possible to remove the language: "Language cannot be removed because it is in use by the following site: Site1"