Mark configuration strings untranslatable.

Change-Id: If8a35fe33e2091bcf95cc543e76df1184d52ce2b
diff --git a/java/res/values-xlarge/config.xml b/java/res/values-xlarge/config.xml
index a6fbea6..56b9a16 100644
--- a/java/res/values-xlarge/config.xml
+++ b/java/res/values-xlarge/config.xml
@@ -29,7 +29,7 @@
     <!-- Whether or not Popup on key press is enabled by default -->
     <bool name="config_default_popup_preview">false</bool>
     <!-- This configuration is the index of the array {@link KeyboardSwitcher.KEYBOARD_THEMES}. -->
-    <string name="config_default_keyboard_theme_id">5</string>
-    <string name="config_text_size_of_language_on_spacebar">medium</string>
+    <string name="config_default_keyboard_theme_id" translatable="false">5</string>
+    <string name="config_text_size_of_language_on_spacebar" translatable="false">medium</string>
     <integer name="config_max_popup_keyboard_column">9</integer>
 </resources>