Improve date formatting with explicit safeHTML

[davidsvida]

What does this PR change? What problem does it solve? This PR improves the previous fix for the date formatting issue in the development environment by explicitly using safeHTML for each metadata component. This ensures that all metadata, including the date, reading time, word count, and author, is correctly formatted and rendered without HTML entities being escaped.

Was the change discussed in an issue or in the Discussions before? This PR is related to Issue #1344, which addressed the initial problem of escaped HTML in the post metadata. This PR enhances the solution to ensure comprehensive and explicit handling of HTML content.

PR Checklist

• [ ] This change adds/updates translations and I have used the template present here.
• [ ] I have enabled maintainer edits for this PR.
• [ ] I have verified that the code works as described/as intended.
• [ ] This change adds a Social Icon which has a permissive license to use it.
• [ ] This change does not include any CDN resources/links.
• [ ] This change does not include any unrelated scripts such as bash and python scripts.
• [ ] This change updates the overridden internal templates from HUGO's repository.

[sonarcloud[bot]]

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