How to Change default fallback font (for non-latin languages)

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Add it in the Language Preferred Fallback List as you did, but make sure you are using the PostScript name for the font. It has to be exact!

<array>
    <!-- for Thai  -->
    <string>th</string>
    <!-- below is the case sensitive PostScript name  -->
    <string>CSPraJad</string>
</array>

References:
https://gist.github.com/Moligaloo/3180490
https://github.com/zerustech/font-fallbacks-tutorial
https://github.com/zonble/tcfail/

How to Change default fallback font (for non-latin languages)

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