Escape "#" sign in XML file

Change-Id: Icd38abc4a0454ca949613d8c4bb528758cd990d8
diff --git a/java/res/xml/rowkeys_pcqwerty1.xml b/java/res/xml/rowkeys_pcqwerty1.xml
index 0ecda35..b2d1d37 100644
--- a/java/res/xml/rowkeys_pcqwerty1.xml
+++ b/java/res/xml/rowkeys_pcqwerty1.xml
@@ -41,7 +41,7 @@
                 latin:moreKeys="!text/more_keys_for_symbols_2" />
             <Key
                 latin:keyLabel="3"
-                latin:additionalMoreKeys="#"
+                latin:additionalMoreKeys="\#"
                 latin:moreKeys="!text/more_keys_for_symbols_3" />
             <Key
                 latin:keyLabel="4"