Cannot create fieldset with different Instance Language without English Title

• Type: Regression Bug
• Status: Closed
• Resolution: Fixed
• Affects Version/s: Master
• Fix Version/s: 7.4.1 CE GA2, 7.4.2 CE GA3, 7.4.13 DXP GA1, Master
• Component/s: Data Engine
• Labels:
  • QA-AUTOMATION
• Fix Priority: 4
• Git Pull Request: https://github.com/liferay-data-engine/liferay-portal/pull/508
• QA Test Name:
  • LocalFile.LocalizedFieldsetsWebContent#LocalizedFieldsetWithDifferentInstanceLanguage
• QA Test Score: 5

Description
By clicking on the delete button on the fieldset sidebar, the fieldset can't be deleted.
Steps to Reproduce

1. Go to Configuration > Control Panel > Instance Settings
2. Change the instance language
3. Go to Content & Data > Web Content > Structures
4. Add a Structure and select to create a fieldset.
5. Insert the instance language title
6. Inset a text and numeric field and pt it on the structure.
7. Click on the save button.

Expected Result
The fieldset is created properly.
Actual Result
The fieldset can't be created without an english fieldset title.
Reproduced In
master: e4162a50d26867da7ad6a4755c764eb1d565a531