Adding Sinhala and Japanese localizations

[dylmcgold]

This change resolves #283 and #301 by adding Sinhala and Japanese localizations.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.54%. Comparing base (659b497) to head (8ef4b95).

Additional details and impacted files

@@           Coverage Diff           @@
##           latest     #408   +/-   ##
=======================================
  Coverage   90.54%   90.54%           
=======================================
  Files          46       46           
  Lines        4188     4188           
  Branches      556      556           
=======================================
  Hits         3792     3792           
  Misses        273      273           
  Partials      123      123           

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[goatshriek]

Thank you very much for putting together this update with not just one but two new locales! I believe the only fix needed is to add the L10N_NETWORK_CLOSED_ERROR_MESSAGE definition to the si-lk.h header, which is causing the two test build failures.

[dylmcgold]

I added the missing header, thanks for reviewing it. I didn't know how to review the issue myself, but now I see the error message with an undeclared header.

[goatshriek]

Thanks once again for putting this together, and for responding quickly to the requested changes! It is greatly appreciated!