fix bug 1419466 - added jinja2 extension of translating the 404 page

[hritvi]

This commit adds the extension of jinja2 for translating the "Not Found" in the jinja2/404.html file and in the jinja2/500.html page

[jwhitlock]

Thanks @hritvi! This is correct for the 404 page. Do you want to make a similar change for the 500 page?

https://github.com/hritvi/kuma/blob/3daffb2ff45aef851cfbfc3c8b7d49980aa149b3/jinja2/500.html#L16

[codecov-io]

Codecov Report

Merging #4655 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #4655   +/-   ##
=======================================
  Coverage   95.32%   95.32%           
=======================================
  Files         260      260           
  Lines       23534    23534           
  Branches     1688     1688           
=======================================
  Hits        22434    22434           
  Misses        888      888           
  Partials      212      212

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[jwhitlock]

Thanks @hritvi! This works locally: