Update french and belgium french translations

Add missing translations.
Add DateHumanize and TimeSpanHumanize unit tests for 'fr' and 'fr-BE'
culture.
Remove redundants test cases
Update release notes
Add tests for french and belgian french
Remove more redundants test cases
Merge branch 'french'
Add NumberToWordsTests for invariant culture
Add ToQuantityTests for invariant culture
(re)setting CurrentCulture on ambient culture
Merge branch 'tests-for-invariant-culture'
Added Spanish toWords
Adding PR to release notes
Cleaning up my braces
tidying up ToWords converter particularly Spanish
Merge branch 'es-ToWords'
Added Polish translation for ToWords
Added Polish localization test for Now and NoTime
Added PR to the release notes
minor cleanup
Merge branch 'polish'