Allow number properties in plurals macro

[plourenco]

Closes #770

[codecov]

Codecov Report

Merging #771 into next will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             next     #771   +/-   ##
=======================================
  Coverage   84.25%   84.25%           
=======================================
  Files          38       38           
  Lines        1251     1251           
  Branches      332      332           
=======================================
  Hits         1054     1054           
  Misses        117      117           
  Partials       80       80           

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[tricoder42]

Perfect, thank you! 👍