Temporal addition of Korean l10n

Since the localization project didn't allow me to contribute, I ended up open ip the repo, add up the file, localize, and finally have it able to apply.

- Added: l10n/phrases_ko.go // korean l10n
- Modified: l10n/strings.go // Add casing to have above change able to apply

l10n/strings.go

@@ -34,6 +34,8 @@ func Strings(lang string) map[string]string {
 		return phrasesIT
 	case "ja":
 		return phrasesJA
+	case "ko":
+		return phrasesKO
 	case "lt":
 		return phrasesLT
 	case "mk":