text: Title: DoesNotExist at /en/software/features - Language matching query does not exist.
  Body: ## Steps to Reproduce
  
  I did a clean install, following the docker guide for setting up a docker production instance (used the default docker-compose).
  
  **Expected results:**
  enter ip:port and access the WebUI with default credentials
  
  **Actual results:**
  Continuously getting a django error
  
  <details>
    <summary>Logs</summary>
  
  <!--
        Any logs you think would be useful (if you have a local instance)
  -->
  
  ```bash
  Environment:
  
  
  Request Method: GET
  Request URL: http://10.100.10.2/en/software/features
  
  Django Version: 3.2.10
  Python Version: 3.9.5
  Installed Applications:
  ('django.contrib.auth',
   'django.contrib.contenttypes',
   'django.contrib.messages',
   'django.contrib.sessions',
   'django.contrib.sites',
   'django.contrib.staticfiles',
   'django_extensions',
   'storages',
   'wger.config',
   'wger.core',
   'wger.mailer',
   'wger.exercises',
   'wger.gym',
   'wger.manager',
   'wger.nutrition',
   'wger.software',
   'wger.utils',
   'wger.weight',
   'wger.gallery',
   'wger.measurements',
   'captcha',
   'django.contrib.sitemaps',
   'easy_thumbnails',
   'compressor',
   'crispy_forms',
   'rest_framework',
   'rest_framework.authtoken',
   'django_filters',
   'django_bootstrap_breadcrumbs',
   'corsheaders')
  Installed Middleware:
  ('corsheaders.middleware.CorsMiddleware',
   'django.middleware.common.CommonMiddleware',
   'django.contrib.sessions.middleware.SessionMiddleware',
   'django.middleware.csrf.CsrfViewMiddleware',
   'django.contrib.auth.middleware.AuthenticationMiddleware',
   'wger.utils.middleware.JavascriptAJAXRedirectionMiddleware',
   'wger.utils.middleware.WgerAuthenticationMiddleware',
   'wger.utils.middleware.RobotsExclusionMiddleware',
   'django.contrib.messages.middleware.MessageMiddleware',
   'django.middleware.clickjacking.XFrameOptionsMiddleware',
   'django.middleware.locale.LocaleMiddleware')
  
  
  
  Traceback (most recent call last):
    File "/home/wger/src/wger/utils/language.py", line 54, in load_language
      language = Language.objects.get(short_name=used_language)
    File "/usr/local/lib/python3.9/dist-packages/django/db/models/manager.py", line 85, in manager_method
      return getattr(self.get_queryset(), name)(*args, **kwargs)
    File "/usr/local/lib/python3.9/dist-packages/django/db/models/query.py", line 435, in get
      raise self.model.DoesNotExist(
  
  During handling of the above exception (Language matching query does not exist.), another exception occurred:
    File "/usr/local/lib/python3.9/dist-packages/django/core/handlers/exception.py", line 47, in inner
      response = get_response(request)
    File "/usr/local/lib/python3.9/dist-packages/django/core/handlers/base.py", line 181, in _get_response
      response = wrapped_callback(request, *callback_args, **callback_kwargs)
    File "/home/wger/src/wger/software/views.py", line 37, in features
      return render(request, 'features.html', context)
    File "/usr/local/lib/python3.9/dist-packages/django/shortcuts.py", line 19, in render
      content = loader.render_to_string(template_name, context, request, using=using)
    File "/usr/local/lib/python3.9/dist-packages/django/template/loader.py", line 62, in render_to_string
      return template.render(context, request)
    File "/usr/local/lib/python3.9/dist-packages/django/template/backends/django.py", line 61, in render
      return self.template.render(context)
    File "/usr/local/lib/python3.9/dist-packages/django/template/base.py", line 168, in render
      with context.bind_template(self):
    File "/usr/lib/python3.9/contextlib.py", line 117, in __enter__
      return next(self.gen)
    File "/usr/local/lib/python3.9/dist-packages/django/template/context.py", line 244, in bind_template
      updates.update(processor(self.request))
    File "/home/wger/src/wger/utils/context_processor.py", line 28, in processor
      language = load_language()
    File "/home/wger/src/wger/utils/language.py", line 57, in load_language
      language = Language.objects.get(short_name="en")
    File "/usr/local/lib/python3.9/dist-packages/django/db/models/manager.py", line 85, in manager_method
      return getattr(self.get_queryset(), name)(*args, **kwargs)
    File "/usr/local/lib/python3.9/dist-packages/django/db/models/query.py", line 435, in get
      raise self.model.DoesNotExist(
  
  Exception Type: DoesNotExist at /en/software/features
  Exception Value: Language matching query does not exist.
  
  ```
  
  Attached a full report:
  [DoesNotExist at _en_software_features.pdf](https://github.com/wger-project/wger/files/7797751/DoesNotExist.at._en_software_features.pdf)
  
  </details>
  
  **At the bottom it is mentioned, that I am seeing this stack Trace because Django Debug was set to True. But the prod.env is set to False...**