replaceAll polyfill

[1v4n4]

JavaScript method replaceAll is too advanced for older browsers, which makes the widget usable only for 93.66 % of browsers.
Apparently, there is no reliable polyfill solution available.

[tttp]

@1v4n4 can you check the PR?

I did:

• check that the polyfill is added to the bundle
  I didn't:
• check if it fixes on the old browser you looked at

Could you look at the code and if you can easily test locally from browserstack, let's do it, otherwise, less push to staging and you test there