Fix support for SOGoSieveFolderEncoding defaults

Fixed the following bugs in the mail filter editor:

1. Sieve folder encoding not respecting the SOGoSieveFolderEncoding
system defaults;
2. Conditions are still displayed when rule affects all messages;
3. Missing custom mail labels to "flag with" action.

UI/PreferencesUI/English.lproj/Localizable.strings

@@ -319,11 +319,27 @@
 "Header" = "Header";
 "Body" = "Body";
 "Flag the message with" = "Flag the message with";
+
+/* Select field label of "flag message" mail filter action */
+"Flag" = "Flag";
+
 "Discard the message" = "Discard the message";
 "File the message in" = "File the message in";
+
+/* Select field label of "file message" mail filter action */
+"Mailbox" = "Mailbox";
+
 "Keep the message" = "Keep the message";
 "Forward the message to" = "Forward the message to";
+
+/* Input field label of "forward" mail filter action */
+"Email" = "Email";
+
 "Send a reject message" = "Send a reject message";
+
+/* Input field label of "reject" mail filter action */
+"Message" = "Message";
+
 "Send a vacation message" = "Send a vacation message";
 "Stop processing filter rules" = "Stop processing filter rules";
 "is under" = "is under";