[w3c/manifest] Noting that shortcut strings are localizable (#897)

Closes #872

This change (choose one):

* [ ] Breaks existing normative behavior (please add label "breaking")
* [x] Adds new normative requirements
* [ ] Adds new normative recommendations or optional items
* [ ] Makes only editorial changes (only changes informative sections, or
  changes normative sections without changing behavior)
* [ ] Is a "chore" (metadata, formatting, fixing warnings, etc).

Implementation commitment (delete if not making normative changes):

* [ ] Safari (link to issue)
* [ ] Chrome (link to issue)
* [ ] Firefox (link to issue)
* [ ] Edge (public signal)

Commit message:

Per #872, implementors are parsing `lang` and `dir`, but no one (that we know of) is implementing directionality, so I have left "Implementation commitment" blank for now.

You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/manifest/pull/897

-- Commit Summary --

  * Making shortcuts directionally aware
  * directionality-capable members -> localizable string members
  * more directionality-capable members -> localizable string members

-- File Changes --

    M index.html (19)

-- Patch Links --

https://github.com/w3c/manifest/pull/897.patch
https://github.com/w3c/manifest/pull/897.diff

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