Translator Mocks and Automatically Formatting Date and Time based on Locale

[BKHMSI]

• Translator Mocks
  • Using stubs for functions that uses api-calls in language translator unit-tests using sinon module
  • Removed translator key from language translator tests
• Automatically Formatting Date and Time based on Locale
  • Removed hard-coded date/time format
  • Using already existing moment module to automatically format them based on locale
  • Corrected date format in locale converter test based on moment: YYYY-MM-DD => YYYY/MM/DD
  • Now time is correctly formatted according to locale

[msftclas]

All CLA requirements met.

[coveralls]

Pull Request Test Coverage Report for Build 649

• 23 of 24 (95.83%) changed or added relevant lines in 2 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+7.2%) to 69.491%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
libraries/botbuilder-ai/src/languageTranslator.ts	16	17	94.12%

Totals
Change from base Build 646:	7.2%
Covered Lines:	2004
Relevant Lines:	2751

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💛 - Coveralls

[cleemullins]

@BKHMSI A number of changes were just made in the C# version of this library to migrate it to the latest set of Translation APIs, as the current API versions are depricated. How does this change align with that?

See the C# PR here: microsoft/botbuilder-dotnet#789

[Stevenic]