Hotfix: missing CLDR data on locale switch.

[mwistrand]

Type: bug

Fixes a bug that results in an error being thrown when the locale is switched and message formatting is required. This particular bug is caused by the fact that Globalize.js requires that at least an empty object for a locale has been registered with Cldr.js (h/t @rorticus for the fix).

Related Issue: #59

Please review this checklist before submitting your PR:

• [x] There is a related issue
• [x] All contributors have signed a CLA
• [x] All code matches the style guide
• [] The code passes the CI tests
• [x] Unit or Functional tests are included in the PR
• [] The PR increases or maintains the overall unit test coverage percentage
• [x] The code is ready to be merged

[codecov-io]

Codecov Report

Merging #60 into master will increase coverage by <.01%. The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #60      +/-   ##
==========================================
+ Coverage   98.84%   98.84%   +<.01%     
==========================================
  Files          10       10              
  Lines         346      347       +1     
  Branches       46       46              
==========================================
+ Hits          342      343       +1     
  Partials        4        4

Impacted Files	Coverage Δ
src/i18n.ts	97.41% <100%> (+0.02%)	:white_check_mark:

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