Add storybook-addon-intl to addon gallery

[floriangosse]

see subject

[codecov]

Codecov Report

Merging #1143 into master will increase coverage by 0.08%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1143      +/-   ##
==========================================
+ Coverage   12.75%   12.84%   +0.08%     
==========================================
  Files         199      198       -1     
  Lines        4571     4540      -31     
  Branches      724      718       -6     
==========================================
  Hits          583      583              
+ Misses       3347     3322      -25     
+ Partials      641      635       -6

Impacted Files	Coverage Δ
app/react-native/src/manager/provider.js	0% <0%> (ø)	⬆️
...react-native/src/manager/components/PreviewHelp.js

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[shilman]

Thanks for the addition! Looks super useful! 🙇