XF 2.1 Specifying a character set early is below average on GTmetrix

[Aivaras]

Using XF 2.1.5 here. GTmetrix is telling me the following resources have no character set specified in their HTTP headers:

• /styles/fonts/fa/fa-brands-400.woff2
• /styles/fonts/fa/fa-light-300.woff2
• /styles/fonts/fa/fa-regular-400.woff2
• /styles/fonts/fa/fa-solid-900.woff2

These are font files, to begin with. As a result, I'm not sure where and how to specify HTTP headers for them. Can you, please, suggest how to fix this?

 

[Aivaras]

Still struggling with this one. Help needed.