[5.1] Fix encoding for a few popup links

[Fedik]

Pull Request for Issue #43013 .

Summary of Changes

Fix encoding for a popup links, for Finder and Redirect plugins.

Testing Instructions

Please follow #43013

Or add language overide:

COM_REDIRECT_EDIT_PLUGIN_SETTINGS="Тест"
COM_FINDER_EDIT_PLUGIN_SETTINGS="Тест"

Disable plugins Content - Finder, and System - Redirect.
Visit the Finder index and Redirects overview pages, and click on the link in the message.

Actual result BEFORE applying this Pull Request

Popup with broken heading

Expected result AFTER applying this Pull Request

Popup with text Тест

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

[Kostelano]

I have tested this item ✅ successfully on 8692982

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_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/43874.}

[fgsw]

I have tested this item ✅ successfully on 8692982

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_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/43874.}

[bembelimen]

Thx