Unable to delete translations of the web content

• Type: Bug
• Status: Closed
• Resolution: Fixed
• Affects Version/s: 7.1.X, 7.2.X, Master
• Fix Version/s: 7.1.10 DXP FP20, 7.1.10.5 SP5, 7.1.X, 7.2.10 DXP FP9, 7.2.X, 7.3.5 CE GA6, 7.3.10 DXP GA1, Master
• Component/s: Dynamic Data Mapping, Web Content > Web Content Administration
• Labels:
  • ee-ts
  • liferay-dxp-71-sp5
  • liferay-fixpack-dxp-20-7110
  • liferay-fixpack-dxp-9-7210
• Branch Version/s:
  7.2.x, 7.1.x
• Backported to Branch:
  Committed
• Fix Priority: 4
• Sprint: Data_Engine_7.3_32
• Git Pull Request: https://github.com/jeyvison/liferay-portal/pull/866

Reproduction Steps:
1. Set up a vanilla 7.1.x/7.2.x/7.3.x
2. Go to Control Panel --> Configuration --> System Settings --> Web Content and select "Administration" then find the option "Changeable Default Language" and check the box to activate it.
3. Go to Control Panel --> Configuration --> Instance Settings --> Miscellaneous and make sure that the English Language is the default language.
4. Under the Liferay Site (or any site) go to Content Panel --> Web content and add a Basic Web Content. However, change the Default Language on the top, for example, fr_FR and add the title and content then Publish.
Checkpoint: Check Journalarticle in the database and at the "Content" section you should see something like:

'<?xml version="1.0"?>


<root available-locales="fr_FR,en_US" default-locale="fr_FR">
	<dynamic-element name="content" type="text_area" index-type="text" instance-id="ccun">
		<dynamic-content language-id="fr_FR"><![CDATA[<p>French Test</p>]]></dynamic-content>
		<dynamic-content language-id="en_US"><![CDATA[]]></dynamic-content>
	</dynamic-element>
</root>'

In order to delete the US English translation that should not appear, do the following steps:
a. Click on the 3 dots beside the Web Content and select "Delete Translations"
b. A popup window opens with the translations. Check the English translation to delete and try to delete it.
Actual Result: The request fails with the error:
Your request failed to complete.
Expected Result: The translation should be successfully deleted with no issues or the empty translation should not be created