Use dateFormat hugo function to support localization

[ColinMaudry]

https://gohugo.io/functions/dateformat/

What problem does this PR solve?

Dates are not formatted according the the language locale specified in config.toml. It sticks to English.

Is this PR adding a new feature?

Sort of: now people can choose to display dates according to the language they want (defaultContentLanguage config).

Is this PR related to any issue or discussion?

Nope

PR Checklist

• I have verified that the code works as described/as intended.
  • It does, but I didn't find a way to format dates UK style, only US style 😕 (15 Feb 2022 vs. Feb 15, 2022) fixed in config
• This change adds a social icon which has a permissive license to use it.
• This change does not include any external library/resources.
• This change does not include any unrelated scripts (e.g. bash and python scripts).
• I have enabled maintainer edits for this PR.

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[hugo-sid]

Hi Colin.

Thanks a lot for contributing to this theme.

I appreciate your efforts to improve this theme.

I consider formatting dates as per language locale as an important feature.

The Netlify preview associated with this PR is old one. Meaning the preview was built, at the time when you opened a draft PR.

The Netlify preview seems to be most recent one.

[hugo-sid]

Looks great @ColinMaudry !