Uploading too large of an image as an avatar shouldn't redirect to a 413 "Request Entity Too Large" page

[vxern]

I tried uploading a new avatar for my profile, which was a 5 MB image file, which threw me out onto this page:

I would propose that instead of this, Tatoeba wouldn't allow files that are larger than a predefined size limit, and if that limit is crossed, would show a simple dialog or error message telling the user the file they tried to upload is too large.