diff --git a/internal/check-poster-card-fits.mjs b/internal/check-poster-card-fits.mjs
index 6f8713b34..a18dc629d 100644
--- a/internal/check-poster-card-fits.mjs
+++ b/internal/check-poster-card-fits.mjs
@@ -32,6 +32,21 @@ const LEAF = process.argv[2] || DEFAULT_LEAF
 const WIDTHS = (process.env.CARD_FIT_WIDTH || '390,768,1024,1440,1920')
   .split(',').map((n) => Number(n.trim())).filter(Boolean)
 
+// ★ AND SWEEP LOCALES, for exactly the same reason the widths are swept. The Driver's requirement
+// was "full words visible AND support localization"; this gate only ever ran in English, which is
+// the shortest of the eleven. MEASURED 2026-09-24 at 1440px, the three print labels:
+//   en  Prayer List 76px · Card Deck 72px · Poster Map 79px
+//   ro  Listă de rugăciune 122px · Pachet de cartonașe 133px · Harta afișului 92px  (+75%)
+//   zh  禱告名單 56px · 禱告卡組 56px · 海报地图 56px
+// Romanian is the widest RENDERED, which is the property that matters — not the longest string.
+// Chinese is only 4 characters yet each glyph is near double-width, so a character-count heuristic
+// would have picked the wrong worst case. The gate asserts scrollWidth > clientWidth, which is
+// pixels, so the sweep has to be pixels too.
+// en is always included as the control; ro and zh are the measured extremes. Override with
+// CARD_FIT_LANG to check a specific locale.
+const LANGS = (process.env.CARD_FIT_LANG || 'en,ro,zh')
+  .split(',').map((s) => s.trim()).filter(Boolean)
+
 let reachable = false
 try { const r = await fetch(LEAF, { signal: AbortSignal.timeout(4000) }); reachable = r.ok } catch { /* precondition */ }
 if (!reachable) {
@@ -44,10 +59,15 @@ const WALK = `(root, out) => { out = out || []; const rec = (r) => { for (const
 
 const browser = await chromium.launch({ args: ['--use-gl=swiftshader', '--enable-unsafe-swiftshader'] })
 
-async function measure(width) {
+async function measure(width, lang) {
   const mobile = width < 500
   const page = await browser.newPage({ viewport: { width, height: 1000 }, isMobile: mobile, hasTouch: mobile })
-  await page.goto(LEAF, { waitUntil: 'load', timeout: 45000 })
+  // ?lang= is how the app selects a locale (library/i18n/index.js:83). Appended rather than
+  // replaced so a caller can still pass a leaf URL that already carries query params.
+  const url = lang && lang !== 'en'
+    ? LEAF + (LEAF.includes('?') ? '&' : '?') + 'lang=' + encodeURIComponent(lang)
+    : LEAF
+  await page.goto(url, { waitUntil: 'load', timeout: 45000 })
   await page.waitForTimeout(10000)
 
   // ★ HOVER IS INVISIBLE TO A STATIC PROBE, which is exactly how the blue outline stayed
@@ -164,12 +184,12 @@ async function measure(width) {
              controls: ctrls.length, tiny: tiny.length }
   })()`)
   await page.close()
-  return { width, hover, ...out }
+  return { width, lang, hover, ...out }
 }
 
 const results = []
 try {
-  for (const w of WIDTHS) results.push(await measure(w))
+  for (const lang of LANGS) for (const w of WIDTHS) results.push(await measure(w, lang))
 } finally {
   await browser.close()
 }
@@ -177,7 +197,7 @@ try {
 console.log('POSTER-CARD-FITS')
 console.log(`  leaf      : ${LEAF}`)
 for (const r of results) {
-  console.log(`  ${String(r.width).padStart(4)}px   cards ${String(r.cards).padStart(2)}`
+  console.log(`  ${(r.lang || 'en').padEnd(2)} ${String(r.width).padStart(4)}px   cards ${String(r.cards).padStart(2)}`
     + ` · overflow ${r.overflowing}${r.worst ? ` (${r.worst}px)` : ''}`
     + ` · neighbour ${r.intrusions}`
     + ` · over-preview ${r.coveringPreview}${r.worstY ? ` (${r.worstY}px)` : ''}`
@@ -193,7 +213,7 @@ for (const r of results) {
 
 const fails = []
 for (const r of results) {
-  const at = `${r.width}px`
+  const at = `${r.lang || 'en'} ${r.width}px`
   // PRECONDITION: no cards means nothing was tested at this width — not a pass.
   if (!r.cards) { fails.push(`${at}: no poster cards rendered — wrong url, or the wall did not mount`); continue }
   if (!r.rows) { fails.push(`${at}: ${r.cards} card(s) but none carry a .pfs print-options row`); continue }
@@ -274,6 +294,9 @@ if (fails.length) {
   for (const f of fails) console.error('  - ' + f)
   process.exit(1)
 }
-console.log(`\nPOSTER-CARD-FITS: PASS — at ${results.length} width(s) (${WIDTHS.join(', ')}px) every `
+// Report widths x LOCALES, not the product. "15 width(s)" misdescribes 5 widths in 3 languages,
+// and a summary that overstates its own coverage is how a green line stops meaning anything.
+console.log(`\nPOSTER-CARD-FITS: PASS — ${WIDTHS.length} width(s) (${WIDTHS.join(', ')}px) `
+  + `x ${LANGS.length} locale(s) (${LANGS.join(', ')}) = ${results.length} combination(s). Every `
   + 'print-options row sits inside its own card and below its preview, with every control still '
-  + 'big enough to press.')
+  + 'big enough to press and its label fully readable in every locale checked.')