GWQuoting is a add-on for GroupWise. When active it parses the text of the reply message and applies internet-style quoting to. Long lines are wrapped after 72 characters and a quoting mark ('>') included a space is inserted in front of the line.
Yes it can. If you are familiar with setting configuration options via the registry editor regedit, you can customize the 'wroteon' phrase by editing the value WroteOnString in the key:
GWQuoting is not always able to correctly locate the beginning of the date in the header of the cited message. When this happens the phrase 'wrote on' appears somewhere in the date. This actually happens only if you configured your client to use a long date/time format as mailbox date/time format. (See the screenshot below). At this time, this issue can only be solved by setting the mailbox date/time format to short format.