The "Page not found" header and the action buttons are displayed on the same row when switching to French

Steps to reproduce:

1. Add a page name in URL

You will find attached two images (v1 and v2):
v1 - an older image of Notice (Note)
v2 - the image of Notice in 6.1

I think that v1 is better than v2 because the text is well aligned (title and content).