Switch language based on user agent

[clementbiron]

That changeset:

• render default english website in the subdirectory /en and define all the necessary redirections, for exemple https://opentermsarchive.org/privacy-policy to https://opentermsarchive.org/en/privacy-policy
• redirects requested pages without any query language parameter depending on the browser's language preferences, for example https://opentermsarchive.org redirects to https://opentermsarchive.org/fr/ with my browser configured in french, https://opentermsarchive.org/impact redirects to https://opentermsarchive.org/en/impact with my browser configured in english
  • adds tests to verify the added behaviours and runs them in CI

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