Add lang="en" to untranslated English content in 6 non-English article pages

[Copilot]

Six non-English pages (DE, AR, ZH, KO, FR, ES) contained English-language paragraphs and list items without lang="en" markup, causing incorrect language signaling for screen readers and SEO tooling. This brings them in line with the already-fixed NL page.

Changes

• 57 lang="en" attributes added per file across:
  • 20 proposition "Published" date <p> elements
  • 20 "Why it matters" <p> elements (translated label + English body)
  • 2 Policy Implications context-box <p> elements
  • 7 Deep Analysis section <p> elements
  • 4 Key Takeaways <li> elements (newly marked; not addressed in NL fix)
  • 4 Watch section <li> elements (newly marked; not addressed in NL fix)

Example

<!-- Before -->
<p>The government has submitted 20 propositions across 8 ministerial departments…</p>
<li>20 propositions across 8 departments represent the government's most concentrated…</li>

<!-- After -->
<p lang="en">The government has submitted 20 propositions across 8 ministerial departments…</p>
<li lang="en">20 propositions across 8 departments represent the government's most concentrated…</li>

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