Use Bootstrap 4 fonts as fallback
Use Bootstrap 4 fonts as fallback

After migrating to Bootstrap 4, font-family definitions were kept
intact.

We still use the same custom Google Web Fonts, but we can update the
fallback fonts to what Bootstrap 4 uses by default, which is a longer
list than Bootstrap 3.

Reference:
https://getbootstrap.com/docs/4.3/content/reboot/#native-font-stack

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