AttributeError: translate(dest=[]) passed language is not supported: None

[mrf345]

Describe the bug
When using a browser other than firefox, and chrome, the default language session variable seems to be missing.

To Reproduce
Steps to reproduce the issue:

1. Use browser, other than chrome, and firefox.

Error:

  File "/home/mrf3/Projects/FQM/templates/index.html", line 28, in top-level template code
    {{ beloadingNotifier(version, beload=False, release=translate("You are using an older version of FQM, a newer release is available on fqms.github.io", 'en', [defLang]), firefox=translate("You are not using Firefox browser, which this project is designed and most suited for.", 'en', [defLang])) }}
  File "/home/mrf3/Projects/FQM/.venv/lib/python3.9/site-packages/flask_googletrans/__init__.py", line 116, in translate
    raise(AttributeError(
AttributeError: translate(dest=[]) passed language is not supported: None