Add type for locale prop.

[pahuta]

Add type for locale prop.

Close #337

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[codecov]

Codecov Report

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@@            Coverage Diff            @@
##             master     #338   +/-   ##
=========================================
  Coverage          ?   92.35%           
=========================================
  Files             ?        3           
  Lines             ?      327           
  Branches          ?      113           
=========================================
  Hits              ?      302           
  Misses            ?       25           
  Partials          ?        0           

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