"Please enter a valid title" error message is confusing

• Type: Bug
• Status: Closed
• Resolution: Fixed
• Affects Version/s: 7.2.X
• Fix Version/s: 7.2.X, 7.3.10 DXP FP1, 7.3.10.1 DXP SP1, 7.3.6 CE GA7, 7.3.X, Master
• Component/s: Web Content > Web Content Administration
• Labels:
  • ee-ts
  • liferay-dxp-73-sp1
  • liferay-fixpack-dxp-1-7310
  • liferay-fixpack-dxp-9-7210
• Branch Version/s:
  7.2.x
• Backported to Branch:
  Committed
• Fix Priority: 3
• Git Pull Request: https://github.com/liferay-echo/liferay-portal/pull/2632

Steps to reproduce:

1. Start a 7.2 bundle with Fix Pack 7 or above
2. Create a web content
3. Skip the default language and switch to the German translation, fill its title
4. Click on Publish
5. It won't save, error message is shown

Actual behaviour: "Please enter a valid title" error message

Expected behaviour: "Please enter a valid title for the default language: en-US" should be shown