Hello, I m the creator of Translatoid for KDE.
It would be a greate idea to create a "remember system" in your gtranslate.
I explain :
FIRST : The user translate something.. Then he can click on "remember button" which save in a file the association between sourceText and translatedText.

SECOND:
"Remember translation" can be shown inside a Desktop widget. "GtranslateRemember Widget". The text inside would be update every X second after randomisation.. If the user think he know it as well, he can press on widget and remove the translation from the database.

I suggest you to use Sqlite or Xml File..

That would be SOOOOOO Usefull to learn a language!

If you are interesting, contact me !