(I'm the author of gTranslate) Porting gTranslate will be kinda useless. You may have heard that Google is closing their free translation api and in the future you will have to pay for it. The api will be closed on 1st of December so there are some time left. After that the only option I found is to use free Bing translation api (ew!). Currently it's already used Harmattan application Translate Mee (not open source I think...). I might code a new translation application for Harmattan which will be using multiple different sources (Google Translate, Microsoft/Bing translator and dictionaries for single words). Someone else is going make (or have made) similar application(s) so I'm not sure will I make one myself.