Added code to send messages with extended encoding

app/src/main/res/values/strings.xml

@@ -109,4 +109,7 @@ As an alternative you could configure a trusted node in the settings, but as of
     <string name="status_sent">sent</string>
     <string name="status_received">received</string>
     <string name="outbox">Outbox</string>
+    <string name="error_unsupported_encoding">Unsupported encoding ‘%s’, using ‘SIMPLE’ instead.</string>
+    <string name="select_encoding_warning">‘EXTENDED’ is a new encoding that\‘s not widely supported yet but has some interesting features. To stay on the save side, select ‘SIMPLE’.</string>
+    <string name="select_encoding_title">Select Message Encoding</string>
 </resources>