Asynchronously display the UI
When trying to open very large files, gTranslator can take some time to display a window. This can be reproduced by downloading this translation file for Evolution and trying to right-click->open with gTranslator.
I thought it didn't load at all and ended up opening several instances of gTranslator. A nice workaround could be to open an gTranslator immediately, display a "loading view", and asynchronously load the file.
Thanks again for all this already great piece of software :)