[4.4] [BUGFIX] Enforce UTF-8 on CSS Files

[dgrammatiko]

Pull Request for Issue #42611 .

Summary of Changes

Adds @charset "UTF-8"; as a first line on all the CSS files. Docs: https://developer.mozilla.org/en-US/docs/Web/CSS/@charset

Testing Instructions

• Ensure your browser default encoding IS NOT UTF-8
• Download and install Joomla from this Pull Request
• Check that icons don't get weird...

Actual result BEFORE applying this Pull Request

Expected result AFTER applying this Pull Request

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

[brianteeman]

Ensure your browser default encoding IS NOT UTF-8

How?

[dgrammatiko]

How?

Turns out only safari allows changing the default encoding. FF and Chrome do not expose this setting anymore

[Fedik]

I have tested this item ✅ successfully on ec1e092

with utf-8 better than without :)

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[viocassel]

I have tested this item ✅ successfully on ec1e092

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[Quy]

RTC

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[laoneo]

Thanks!