[erkamyaman]

This documents five features of slide.ng core that are in open pull requests:

• The interface language: lang and uiLang, locales/<lang>.json in the deck, a theme or an addon, and Turkish built in. lang sets LOCALE_ID for the date, number and currency pipes. Right-to-left languages mirror the interface. There is a --lang flag and a recipe for one deck in several languages. This adds a new page, "Interface language".
• YouTube embed options in <slide-ng-youtube id="…?start=60">, and the start and list attributes.
• Markdown links to slides move inside the deck, web links open a new tab, and slide links in an exported PDF point at that slide's page.
• themeConfig keys become --slidev-theme-<key> CSS variables. There is a THEME_CONFIG token, and slides can read themeConfig['key'].
• <slide-ng-title-renderer no="N" /> shows a slide's title as HTML. The table of contents shows titles the same way.

The migrating pages drop the items that are now supported.

How I checked it

pnpm install --frozen-lockfile, format:check, test, build and check:dist pass (no broken internal links).

Merge order

Merge this only after these pull requests are merged and released:

• feat(app): translatable interface and multi-language decks slide.ng#11
• fix(components): keep the start time in youtube ids slide.ng#36
• feat(generator): turn markdown links to slides into slide links slide.ng#37
• feat(themes): apply themeConfig as --slidev-theme css variables slide.ng#38
• feat(components): adds title renderer slide.ng#39

The new page links to docs/UI-STRINGS.md on the main branch of slide.ng. That link only works once #11 is merged.

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