Fixed the "twenties" in SpanishNumberToWordsConverter
Updated release_notes
Disable CS1591 for ByteSize class
Documented IDateTimeHumanizeStrategy
Disable CS1591 for TimeUnit,

because the enum fields are self-explainatory.
Documented EnumDehumanizeExtensions
Documented StringDehumanizeExtensions
Documented StringHumanizeExtensions
minor cleanup
Japanese Translate
Changed NoTime to "0 seconds".
Changed tests of TimeSpan to use Theory instead.
shorten Minutes, Seconds and Milliseconds.
add PR to release note
Update release_notes.md
Fix the short forms for multiple units.
Update Resources.ar.resx
Added more tests for new Arabic resource settings
Updated release notes to include PR 231
added the missing xml comments to code & enabled 1591