Localize dates in contact diary (EXPOSUREAPP-4485) (closes #2009) #2021

* Localize dates in contact diary (EXPOSUREAPP-4485) (#2009)

* Add additional unit test to cover US and UK for english date formatting (EXPOSUREAPP-4485) (#2009)

* Adjust expected date strings (EXPOSUREAPP-4485) (#2009)

* Correct the suffix for "year" for bulgarian dates in unit tests (EXPOSUREAPP-4485) (#2009)

* Use SystemInfoProvider implementation instead of static Locale.getDefault (EXPOSUREAPP-4485) (#2009)

* - Revert usage of SystemInfoProvider
- Introduce Context.getLocale() extension function
- Adjust unit tests to use kotest matchers

(EXPOSUREAPP-4485) (#2009)

* (Add accidentally missing files of the previous commit)

- Revert usage of SystemInfoProvider
- Introduce Context.getLocale() extension function
- Adjust unit tests to use kotest matchers

(EXPOSUREAPP-4485) (#2009)

Co-authored-by: I502720 <axel.herbstreith@sap.com>