localization: add Korean(ko_KR) support #3879

Job	Run time
Prepare version string	5s
Build / Build Windows x64	3m 56s
Build / Build macOS (Intel)	3m 16s
Build / Build Windows ARM64	4m 18s
Build / Build Linux	3m 24s
Build / Build macOS (Apple Silicon)	2m 37s
Build / Build Linux (arm64)	3m 17s
Package / Package macOS (osx-x64)	13s
Package / Package Windows (win-x64)	27s
Package / Package Windows (win-arm64)	30s
Package / Package macOS (osx-arm64)	17s
Package / Package Linux (linux-x64)	57s
Package / Package Linux (linux-arm64)	55s
	24m 12s

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