Add toPercent utility for compatibility

[thornbill]

Changes
Should fix compatibility issues with browsers that do not support the Intl functions.

Issues
Should fix part of #4055.

[dmitrylyzo]

LGTM

If we want to support correct percent formatting on older web engines, we need a real polyfill or some custom implementation.
We could use the translation string as the format (as suggested here). But that may not be enough, for example, for Farsi - non-Arabic numbers.
Anyway, I'm not an expert. 🙃

[sonarqubecloud]

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0.6% Duplication

[thornbill]

Yeah I think falling back to the previous behavior should be fine for older platforms that do not support the Intl APIs. The issue with the polyfills I saw was that they required importing multiple polyfills and each locale separately... which is a bit of a pain for such a minor usage.