voices: Add Korean (using espeak-ng) to the nightly voice build set

Change-Id: I8dd3db1fa571353e8a3c06fb6db0d8205530bfd5

apps/lang/korean.lang

@@ -5979,15 +5979,15 @@
   </source>
   <dest>
     *: none
-    hibylinux: "USB:"
-    multivolume: "HD1:"
+    hibylinux: "~USB:"
+    multivolume: "~HD1:"
     sansac200*,sansaclipplus,sansae200*,sansafuze*: "마이크로SD:"
     xduoox3: "마이크로SD2:"
   </dest>
   <voice>
     *: none
-    hibylinux: "U S B"
-    multivolume: "H D 1"
+    hibylinux: "~U S B"
+    multivolume: "~H D 1"
     sansac200*,sansaclipplus,sansae200*,sansafuze*: "마이크로 S D"
     xduoox3: "마이크로 S D 2"
   </voice>

tools/builds.pm

@@ -740,6 +740,17 @@ sub simbuilds {
 	},
         'enabled' => 1,
     },
+    'korean' => {  #
+	'lang' => 'korean',
+	'name' => '한국어 (Korean)',
+        'short' => 'ko_KR',
+        'defengine' => 'espeak',
+	'engines' => {
+	    'espeak' => '-vko',
+	    'gtts' => '-l ko',
+	},
+        'enabled' => 1,
+    },
     'nederlands' => {
 	'lang' => 'nederlands',
 	'name' => 'Nederlands (Dutch)',