Doublepost with a reason: Installed experimental JDiction with joomgallery-XML. Here are my first impressions.
To sum it up: (Almost) everything works beautifully, without any additional programming. Congrats, great work.
Only a small drawback for the existing categories. For some -to me- unknown reason, the link in the flag for the translation was wrong (only for preexisting categories) and even if i entered the right link in the browser URL the translated gallery would not show up (there where some capital letters, were they did not belong and sometimes there even was a link to the main category instead of one to the subcategory, i was in. I did not get the pattern for this behaviour.). I still got the 404. I will test this further and try to recover the preexisting/faulty galleries.
Another side-effect was that a working translation on an article (here a '-en' was added as a postfix) was also defunctional, because of a wrong link on the language flag. A new article worked out of the box.
Greetings, Dorian.