add a warning

apps/files_encryption/appinfo/info.xml

@@ -2,7 +2,7 @@
 <info>
 	<id>files_encryption</id>
 	<name>Encryption</name>
-	<description>Server side encryption of files</description>
+	<description>Server side encryption of files. Warning: You will lose your data if you enable this App and forget your password.</description>
 	<licence>AGPL</licence>
 	<author>Robin Appelman</author>
 	<require>4</require>