Change Details

This is the second half of T155053. Basically, the 404 error page in mobile front end has a very short HTML where the `<html>` tag lacks the 'lang' and 'dir' attributes, and the HTML also lacks the `<meta charset...>` tag. These should be added so that the 404 message is well-formed and shown correctly in RTL wikis.

This is the second half of T155053. Basically, the 404 error page in mobile front end has a very short HTML where the `<html>` tag lacks the 'lang' and 'dir' attributes, and the HTML also lacks the `<meta charset...>` tag. These should be added so that the 404 message is well-formed and shown correctly in RTL wikis. This is because it invokes a 404 using wfHttpError This should be updated to do things the MediaWiki way™