Update Korean to official.

whatsnew.htm

@@ -28,6 +28,11 @@ For conditions of distribution and use, see <a href="https://jrsoftware.org/file
 
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+<p><a name="6.2.3"></a><span class="ver">6.2.3-dev </span><span class="date">(?)</span></p>
+<ul>
+  <li>Added official Korean translation.</li>
+</ul>
+
 <p><a name="6.2.2"></a><span class="ver">6.2.2 </span><span class="date">(2023-02-15)</span></p>
 <ul>
   <li>Changes to further help protect against potential DLL preloading attacks, contributed by Johannes Schindelin from the Git for Windows team.</li>