Pull Request for Issue # .

Summary of Changes

This PR improves System - Language Filter code:

• Add missing $event parameter to event listener methods. Also add void return type declaration to these methods (all event listener methods should have void return type)
• Introduce $app and $language variables to avoid repeat calling methods to get these objects
• Fixed a small bug with onPrivacyCollectAdminCapabilities does not return data properly. It needs to use $event->addResult to return data instead of return command. I will backport this bug fix to 5.2 if required

Testing Instructions

• Expect to have at least one code review from maintainer
• Setup a multilingual website using Joomla 5.3 nightly build, apply patch, navigate to random pages from frontend of your site and make sure nothing is broken.

Actual result BEFORE applying this Pull Request

Works

Expected result AFTER applying this Pull Request

Works, code is better. A small bug is fixed.

Link to documentations

Please select:

• Documentation link for docs.joomla.org:

• No documentation changes for docs.joomla.org needed

• Pull Request link for manual.joomla.org:

• No documentation changes for manual.joomla.org needed