Thread:Translating talk:MediaWiki/New messages for log entries using gender

I am not sure that I understand the qqq pages for the new log entry messages, for example MediaWiki:Logentry-delete-delete/qqq.
 * It says that parameters $1 and $3 are invisible. But in the final log entry they surely are visible?
 * In the old log entries you could not change the position of parameter $1, which was always at the beginning of the log entry, immediately after the date. Has this changed, so that we can move the subject of the sentence ($1) away from the beginning?
 * Is the use of GENDER optional? Will the software show up false error reports if we leave it out when we don't need it?