fix: Riksdagen calendar links in EN agenda entries + localize SV footer

[Copilot]

Two quality issues in the 2026-02-27 week-ahead articles: EN agenda entries had no outbound links, and the SV article used English footer labels with a broken back-link.

news/2026-02-27-week-ahead-en.html

• Wrapped all 33 agenda <h4> entries (Tue–Fri) in date-filtered Riksdagen calendar links with target="_blank" rel="noopener noreferrer":

<h4>
  <a href="https://www.riksdagen.se/en/calendar/?from=2026-03-03&amp;to=2026-03-03"
     target="_blank" rel="noopener noreferrer">
    Civil Affairs Committee meeting
  </a>
</h4>

news/2026-02-27-week-ahead-sv.html

• Localized footer labels (Data Sources → Datakällor, Generated by → Genererad av, Analysis Tools → Analysverktyg)
• Fixed back-link: index.html → index_sv.html

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