One change that is commonly made by a site administrator is to add the Assignee details to the administrator message upon the opening of an issue. This has not been included as a default due to prior expressed preferences.
It is not expected that the progress tag will be used in the email subject header.
It is also extremely unlikely that a progress tag would be included in a SMS message body either, since this is one easy way to exceed the SMS message length limitation. When a SMS message exceeds the specified length it is truncated and a message inserted in the component log, if logging is enabled.
It is expected that some sites will wish to change the text of the messages into their own language. This is perfectly acceptable, only DO NOT change the message type since this would result in the email template not being found and hence no message of that type would be sent.