fix(a11y): localize skip-link/theme-toggle and mark English blocks in 11 multilingual news articles

[Copilot]

Accessibility issues across the 2026-03-05 evening analysis articles: English UI strings on non-English pages, missing lang="en" on inline English content, and missing dir="ltr" on English blocks inside RTL pages (Arabic, Hebrew).

Skip-link & theme-toggle localization (DA, FI, ES)

UI chrome was using English defaults on Danish, Finnish, and Spanish pages:

<!-- before (all three languages) -->
<a class="skip-link" href="#main-content">Skip to main content</a>
<button aria-label="Switch to dark theme" data-label-dark="Switch to light theme" ...>

<!-- after — example: Danish -->
<a class="skip-link" href="#main-content">Spring til hovedindhold</a>
<button aria-label="Skift til mørkt tema" data-label-dark="Skift til lyst tema" ...>

Spanish also gets aria-label="Versiones de idioma" on the language-switcher <nav>.

lang="en" on inline English content

• FR, DA, FI, ES, NO — body is largely English on a non-English page; added lang="en" to every English <p>, the English <h2>, and both <ul> lists (context-box + watch-list).
• DE, ZH, JA — two paragraphs and both <ul> lists were missing the attribute despite the rest of the article already being marked up.
• HE, AR (RTL) — same two paragraphs and both <ul> lists needed lang="en" dir="ltr" so bidirectional layout and screen-reader language switching behave correctly.
• KO — context-box and watch-list <ul> were missing lang="en".

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