This information applies only to our freeware editions.
Most of our freeware software editions have their messages and notifications text hard-coded in a language file, so that these messages cannot be altered/configured via the back-end.
You can change the messages and notifications into your own language by editing the language file. You can avoid this effort by spending a small amount by purchasing a paid edition of the software, because this will - in most cases - allow back-end configuration of front-end messages. Please check the software details before you purchase.