add russian translation for ToWords
add PR to release notes
introduce grammatical case and gender
extract detection of grammatical number for russian
correct PR reference in release notes
extend ToWords with grammatical gender
provide the possiblity to use gender only if required by language
add an overload for gender specific ToWords
update documentation with new ToWords overload
update xml documentation
make INumberToWordsConverter internal as requested by Mehdi
remove unnecessary ToArray conversion
remove dependency on implicit order of enum members
Merge branch 'ru-toWords'