Re: [i18n-activity] Remove the use of printable character from accessKey attribute. (#158)

[whatwg/html 6.5.2 The accesskey attribute](https://html.spec.whatwg.org/multipage/interaction.html#the-accesskey-attribute) states as "one code point in length": 

> If specified, the value must be an ordered set of unique space-separated tokens that are case-sensitive, each of which must be exactly one code point in length.

discussion in this issue need to be considered for issue/proposal for whatwg/html.

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