A far more useful question would be: This is what I want to do. Can I achieve it with the apps that come with a Mac, or do I need another app, like Alfred? OR: I can achieve it with existing Mac apps, but would another app, like Alfred, be considerably easier? The way it's stated above sounds more like, I need an excuse to buy Alfred.
Someone already created a workflow for our favourite MT system: http://www.packal.org/workflow/deepl-translation ;)
Display synonyms from www.synonyms.net:
This Alfred workflow uses the offline translation databases provided by dict.cc:
Substitute words by checking against a thesaurs:
"Ask yourself what Alfred can do for you!"
It would be interesting to explore how Alfred can help Mac users to make creating projects for CafeTran easier.