replace awesomplete with html input datalist & multiple

[nunq]

this has been working in chromium for ages but multiple doesn't work in firefox desktop. also neither datalist autosuggestion nor multiple works in firefox android. see firefox bugtracker:

• desktop: https://bugzilla.mozilla.org/show_bug.cgi?id=1323166 (... issue was created six years ago)
• android: https://bugzilla.mozilla.org/show_bug.cgi?id=1535985 (created four years ago)

so this probably won't be relevant for the next few years ha ha (...)