[BUG] Translation uncaught exception

[seirdotexe]

Describe the bug
When a translatian isn't found, an uncaught exception is thrown.

Traceback (most recent call last):
  File "/usr/local/lib/python3.11/site-packages/flask/app.py", line 2190, in wsgi_app
    response = self.full_dispatch_request()
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/flask/app.py", line 1486, in full_dispatch_request
    rv = self.handle_user_exception(e)
         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/flask/app.py", line 1341, in handle_user_exception
    return self.handle_http_exception(e)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/flask/app.py", line 1281, in handle_http_exception
    return self.ensure_sync(handler)(e)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/whoogle/app/routes.py", line 609, in page_not_found
    return render_template('error.html', error_message=str(e)), 404
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/flask/templating.py", line 151, in render_template
    return _render(app, template, context)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/flask/templating.py", line 132, in _render
    rv = template.render(context)
         ^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/jinja2/environment.py", line 1301, in render
    self.environment.handle_exception()
    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/jinja2/environment.py", line 936, in handle_exception
    raise rewrite_traceback_stack(source=source)
    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/whoogle/app/templates/error.html", line 23, in top-level template code
    <h4><a class="link" href="https://farside.link">{{ translation['continue-search'] }}</a></h4>
    ^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/jinja2/environment.py", line 466, in getitem
    return obj[argument]
           ~~~^^^^^^^^^^
jinja2.exceptions.UndefinedError: 'translation' is undefined

To Reproduce
Steps to reproduce the behavior:

1. Search anything

Deployment Method

• Heroku (one-click deploy)
• Docker
• run executable
• pip/pipx
• Other: [describe setup]

Version of Whoogle Search

• Latest build from Docker
• Version [version number]
• Not sure

Desktop (please complete the following information):

• OS: Windows 11 x64
• Browser: Firefox 123.0b9 (64-bit)

Additional context
Also reported in #1100 (comment)

[varunpan]

I am getting the same error from the latest version and casing my instance to crash.

[ahmad-alkadri]

Found the same error when I clicked the "Dark Design: Deactivate" button at the bottom. Screen record:

Logs output at the end said the same thing:

jinja2.exceptions.UndefinedError: 'translation' is undefined

At a glance it looks like the error is from Jinja.

[ahmad-alkadri]

Drafted a PR that seems to fix this (at least locally on my machines): #1126.

Would be happy to discuss.

[seirdotexe]

Drafted a PR that seems to fix this (at least locally on my machines): #1126.

Would be happy to discuss.

Looks great. Hopefully @benbusby can merge.