Better fallback for bootstrap icons in offline mode (or download locally)

[LuPro]

Probably related to bootstrap being loaded online instead of locally. Fallback when no connection? Download locally?
Googlefonts Montserrat also not available without connection, but that has a viable fallback already (Some Times-like serif font)

[LuPro]

This is not actually the case, I thought my internet cut out completely when it didn't load but apparently it was just very slow/spotty so it tried loading online resources but took forever. With no connection at all the page loads as expected with only bootstrap icons not loading (as those are online). Functionality still is fine, but a better fall back than having empty buttons would be a good idea (or download the bootstrap icons in use locally)

[LuPro]

This is not actually actually the case, jquery was just cached for that test apparently. jquery 3.4.1 was actually downloaded, just not used, so I just changed the online jquery reference on some cdn to the local version and now bootstrap icons really are the last thing loaded online