This brings two new rules that needed fixing:

* `@wordpress/i18n-no-flanking-whitespace` complains about leading or
  trailing whitespace in JS i18n messages. Fix depends on context:
  * Sometimes it makes no difference, the browser (or React) strips it
	out. Removed these.
  * Sometimes it does, or it's unclear. In these cases I added it back
	outside the i18n call.
* `@wordpress/i18n-hyphenated-range` wants en-dashes (or em-dashes) for
  numeric ranges. Switched them to en-dashes.

…int-plugin