Generate KeyboardLabelsSet from donottranslate-more-keys.xml

This change introduces makelabel tool that reads all languages'
donottranslate-more-keys and generate KeyboardLabelsSet.java source
file. The makelabel command must be invoked prior to compile LatinIME.

Change-Id: I7515c7919c535e30f9c80a37bdc831d0f682cd43
diff --git a/java/res/xml/rows_symbols4.xml b/java/res/xml/rows_symbols4.xml
index 3e26650..de7e043 100644
--- a/java/res/xml/rows_symbols4.xml
+++ b/java/res/xml/rows_symbols4.xml
@@ -37,9 +37,9 @@
             <!-- latin:hasShortcutKey="false" -->
             <default>
                 <Key
-                    latin:keyLabel="@string/keylabel_for_comma"
+                    latin:keyLabel="!label/keylabel_for_comma"
                     latin:keyLabelFlags="hasPopupHint"
-                    latin:additionalMoreKeys="@string/more_keys_for_comma"
+                    latin:additionalMoreKeys="!label/more_keys_for_comma"
                     latin:keyStyle="f1MoreKeysStyle" />
             </default>
         </switch>