export locales in ngx-bootstrap/index

[brunocroh]

fixes #2842

• read and followed the CONTRIBUTING.md guide.
• built and tested the changes locally.

[codecov]

Codecov Report

Merging #2879 into development will not change coverage.
The diff coverage is n/a.

@@             Coverage Diff              @@
##           development    #2879   +/-   ##
============================================
  Coverage        70.38%   70.38%           
============================================
  Files              137      137           
  Lines             4092     4092           
  Branches           711      711           
============================================
  Hits              2880     2880           
  Misses             913      913           
  Partials           299      299

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[YevheniiaMazur]

Tested, looks good

[valorkin]

@brunocroh thanks for the contribution! :)