vold_decrypt: Add back missing xml and get rid of compiler warning

Change-Id: I883112e2618f560e96002e2076e2735cc20cfac3
diff --git a/gui/theme/common/languages/en.xml b/gui/theme/common/languages/en.xml
index 72ef5af..c14c346 100644
--- a/gui/theme/common/languages/en.xml
+++ b/gui/theme/common/languages/en.xml
@@ -454,6 +454,7 @@
 		<string name="decrypt_data_failed_pattern">Pattern failed, please try again!</string>
 		<string name="decrypt_data_enter_pattern">Enter Pattern.</string>
 		<string name="decrypt_data_trying">Trying Decryption</string>
+		<string name="decrypt_data_vold_os_missing">Missing files needed for vold decrypt: {1}</string>
 		<string name="term_hdr">Terminal Command</string>
 		<string name="term_s_hdr">Terminal</string>
 		<string name="term_kill_btn">KILL</string>