Add comments for translations.

Change-Id: I57a2c6b39a25d236c83b2b538b5ac174fe2b2d40
diff --git a/res/values/strings.xml b/res/values/strings.xml
index e825b85..9f1f109 100644
--- a/res/values/strings.xml
+++ b/res/values/strings.xml
@@ -484,6 +484,7 @@
         <item>Japanese (ISO-2022-JP)</item>
         <item>Japanese (SHIFT_JIS)</item>
         <item>Japanese (EUC-JP)</item>
+        <!-- No need to translate a EUC-KR part, and there is no string length limits. -->
         <item>Korean (EUC-KR)</item>
         <!-- TODO: We should add a lot more encodings.  -->
     </string-array>