Steps to reproduce:
- Got to https://de.wikipedia.beta.wmflabs.org/wiki/SVG-Test
- The SVG uses no lang parameter, so since T205040: Show SVGs in page language if available it is shown in the content language, here in German.
- Click the image, wait until MMV has finished loading.
Expected: The image in MMV should be in German, too.
Actual: It's in English.