Rename Key.keyLabel attribute to KeySpec

Change-Id: Ida48cd9bdbc01fefad651a005084262c0f46c41c
diff --git a/java/res/xml/row_symbols4.xml b/java/res/xml/row_symbols4.xml
index 09d2a19..09f6b62 100644
--- a/java/res/xml/row_symbols4.xml
+++ b/java/res/xml/row_symbols4.xml
@@ -20,9 +20,9 @@
 
 <merge xmlns:latin="http://schemas.android.com/apk/res/com.android.inputmethod.latin" >
     <Key
-        latin:keyLabel="_" />
+        latin:keySpec="_" />
     <Key
-        latin:keyLabel="/" />
+        latin:keySpec="/" />
     <include
         latin:keyboardLayout="@xml/key_space_symbols" />
     <include