Release 2021.5.9.0

Translate '/Source/NETworkManager.Localization/Resources/Strings.resx…

…' in 'ko_KR' [manual sync] (BornToBeRoot#647)

* Apply translations in ko_KR

translation completed updated for the source file '/Source/NETworkManager.Localization/Resources/Strings.resx'
on the 'ko_KR' language.

* Apply translations in ko_KR

at least 5% translated updated for the source file '/Source/NETworkManager.Localization/Resources/Strings.resx'
on the 'ko_KR' language.

 Manual sync of partially translated files: untranslated content is included with an empty translation or source language content depending on file format

Co-authored-by: transifex-integration[bot] <43880903+transifex-integration[bot]@users.noreply.github.com>
Co-authored-by: BornToBeRoot <16019165+BornToBeRoot@users.noreply.github.com>

Update InnoSetup.iss

Update 04_Changelog.md

Fix BornToBeRoot#444, Fix BornToBeRoot#446 (BornToBeRoot#448)

Co-authored-by: BornToBeRoot <BornToBeRoot@users.noreply.github.com>

Update language files

Update version to 2020.12.2

Display version correctly

Update README.md

Merge branch 'net5-develop' of https://github.com/BornToBeRoot/NETwor…

…kManager into net5-develop