Steps to reproduce:
- Go to https://test.wikipedia.org/wiki/File:SystemLanguage_test.svg
- Click on one of the images in the "Other version" section of the description (not the english one)
- Expected behaviour: MediaViewer shows the image in the correct language
- Actual behaviour: MediaViewer shows image in english
At the moment there's only a very small number of such images (commons:Category:Translation_possible_-_SVG_(switch)), so probably not a big deal initially, but its possible such images will take off in the future. Other formats might have other parameters that are important (PDF/DjVu page comes to mind), it would be nice if we could somehow support extra parameters just in general.