fix(i18n): pluralize units (1 lata vs 3 latas)

src/presentation/components/features/event/ConsumptionSummary.tsx

@@ -43,7 +43,7 @@ export function ConsumptionSummary({ userId }: { userId: string }) {
             <ul className="mb-3 space-y-1 text-sm text-slate-200">
               {blocks.detail.map((d, idx) => (
                 <li key={`${d.item}-${idx}`}>
-                  • {d.item} · {d.quantity} {displayUnit(d.unit, t)}
+                  • {d.item} · {d.quantity} {displayUnit(d.unit, t, d.quantity)}
                 </li>
               ))}
             </ul>

src/presentation/components/features/event/ExpenseForm.tsx

@@ -275,7 +275,7 @@ export function ExpenseForm({
               {listItems.map((p) => {
                 const checked = p.id in links
                 const remaining = Math.max(1, p.totalQuantity - boughtByOthers(p.id))
-                const unit = displayUnit(p.unit, t)
+                const unit = displayUnit(p.unit, t, p.totalQuantity)
                 const assignee = p.assignedTo
                   ? (event.users.find((u) => u.id === p.assignedTo) ?? null)
                   : null

src/presentation/components/features/event/PurchasesTab.tsx

@@ -342,7 +342,7 @@ export function PurchasesTab() {
                   <div className="text-sm text-slate-400">
                     {t(p.kind === 'bring' ? 'purchases.totalToBring' : 'purchases.totalQuantity', {
                       n: Math.round(p.totalQuantity * 100) / 100,
-                      unit: displayUnit(p.unit, t),
+                      unit: displayUnit(p.unit, t, p.totalQuantity),
                     })}
                   </div>
                   <div className="text-xs text-slate-500">
@@ -384,7 +384,7 @@ export function PurchasesTab() {
                         {t('purchases.boughtProgress', {
                           n: round2(bought),
                           total: round2(total),
-                          unit: displayUnit(p.unit, t),
+                          unit: displayUnit(p.unit, t, total),
                         })}
                       </span>
                     </div>

src/presentation/i18n/locales/ca/translation.json

@@ -224,13 +224,27 @@
       "update": "Desa els canvis",
       "units": {
         "units": "unitats",
+        "units_one": "unitat",
+        "units_other": "unitats",
         "bottles": "ampolles",
+        "bottles_one": "ampolla",
+        "bottles_other": "ampolles",
         "cans": "llaunes",
+        "cans_one": "llauna",
+        "cans_other": "llaunes",
         "kg": "kg",
         "liters": "litres",
+        "liters_one": "litre",
+        "liters_other": "litres",
         "grams": "grams",
+        "grams_one": "gram",
+        "grams_other": "grams",
         "bag": "bosses",
+        "bag_one": "bossa",
+        "bag_other": "bosses",
         "tray": "safates",
+        "tray_one": "safata",
+        "tray_other": "safates",
         "single": "Unitat única"
       },
       "unitPlaceholder": "ex. ampolles, garrafa 8L",

src/presentation/i18n/locales/en/translation.json

@@ -224,13 +224,27 @@
       "update": "Save changes",
       "units": {
         "units": "units",
+        "units_one": "unit",
+        "units_other": "units",
         "bottles": "bottles",
+        "bottles_one": "bottle",
+        "bottles_other": "bottles",
         "cans": "cans",
+        "cans_one": "can",
+        "cans_other": "cans",
         "kg": "kg",
         "liters": "liters",
+        "liters_one": "liter",
+        "liters_other": "liters",
         "grams": "grams",
+        "grams_one": "gram",
+        "grams_other": "grams",
         "bag": "bags",
+        "bag_one": "bag",
+        "bag_other": "bags",
         "tray": "trays",
+        "tray_one": "tray",
+        "tray_other": "trays",
         "single": "Single unit"
       },
       "unitPlaceholder": "e.g. bottles, garrafa 8L",

src/presentation/i18n/locales/es/translation.json

@@ -224,13 +224,27 @@
       "update": "Guardar cambios",
       "units": {
         "units": "unidades",
+        "units_one": "unidad",
+        "units_other": "unidades",
         "bottles": "botellas",
+        "bottles_one": "botella",
+        "bottles_other": "botellas",
         "cans": "latas",
+        "cans_one": "lata",
+        "cans_other": "latas",
         "kg": "kg",
         "liters": "litros",
+        "liters_one": "litro",
+        "liters_other": "litros",
         "grams": "gramos",
+        "grams_one": "gramo",
+        "grams_other": "gramos",
         "bag": "bolsas",
+        "bag_one": "bolsa",
+        "bag_other": "bolsas",
         "tray": "bandejas",
+        "tray_one": "bandeja",
+        "tray_other": "bandejas",
         "single": "Unidad única"
       },
       "unitPlaceholder": "ej. botellas, garrafa 8L",

src/presentation/i18n/locales/eu/translation.json

@@ -224,13 +224,27 @@
       "update": "Aldaketak gorde",
       "units": {
         "units": "unitateak",
+        "units_one": "unitate",
+        "units_other": "unitateak",
         "bottles": "botilak",
+        "bottles_one": "botila",
+        "bottles_other": "botilak",
         "cans": "latak",
+        "cans_one": "lata",
+        "cans_other": "latak",
         "kg": "kg",
         "liters": "litroak",
+        "liters_one": "litro",
+        "liters_other": "litroak",
         "grams": "gramoak",
+        "grams_one": "gramo",
+        "grams_other": "gramoak",
         "bag": "poltsak",
+        "bag_one": "poltsa",
+        "bag_other": "poltsak",
         "tray": "erretiluak",
+        "tray_one": "erretilu",
+        "tray_other": "erretiluak",
         "single": "Unitate bakarra"
       },
       "unitPlaceholder": "adib. botilak, garrafa 8L",

src/presentation/i18n/locales/gl/translation.json

@@ -224,13 +224,27 @@
       "update": "Gardar cambios",
       "units": {
         "units": "unidades",
+        "units_one": "unidade",
+        "units_other": "unidades",
         "bottles": "botellas",
+        "bottles_one": "botella",
+        "bottles_other": "botellas",
         "cans": "latas",
+        "cans_one": "lata",
+        "cans_other": "latas",
         "kg": "kg",
         "liters": "litros",
+        "liters_one": "litro",
+        "liters_other": "litros",
         "grams": "gramos",
+        "grams_one": "gramo",
+        "grams_other": "gramos",
         "bag": "bolsas",
+        "bag_one": "bolsa",
+        "bag_other": "bolsas",
         "tray": "bandexas",
+        "tray_one": "bandexa",
+        "tray_other": "bandexas",
         "single": "Unidade única"
       },
       "unitPlaceholder": "ex. botellas, garrafa 8L",

src/presentation/i18n/locales/va/translation.json

@@ -224,13 +224,27 @@
       "update": "Guarda els canvis",
       "units": {
         "units": "unitats",
+        "units_one": "unitat",
+        "units_other": "unitats",
         "bottles": "botelles",
+        "bottles_one": "botella",
+        "bottles_other": "botelles",
         "cans": "llandes",
+        "cans_one": "llanda",
+        "cans_other": "llandes",
         "kg": "kg",
         "liters": "litres",
+        "liters_one": "litre",
+        "liters_other": "litres",
         "grams": "grams",
+        "grams_one": "gram",
+        "grams_other": "grams",
         "bag": "bosses",
+        "bag_one": "bossa",
+        "bag_other": "bosses",
         "tray": "safates",
+        "tray_one": "safata",
+        "tray_other": "safates",
         "single": "Unitat única"
       },
       "unitPlaceholder": "ex. botelles, garrafa 8L",

src/presentation/utils/formatShoppingListText.ts

@@ -1,7 +1,7 @@
 import type { EventSnapshot } from '@/domain/entities/Event'
 import type { PurchaseSnapshot } from '@/domain/entities/Purchase'
 import { displayUnit } from '@/presentation/utils/units'
-type T = (key: string, vars?: Record<string, string>) => string
+type T = (key: string, vars?: Record<string, unknown>) => string
 
 function formatQty(n: number): string {
   return Number.isInteger(n) ? String(n) : String(Math.round(n * 10) / 10)
@@ -33,7 +33,7 @@ function renderBuyLine(event: EventSnapshot, p: PurchaseSnapshot, t: T): string
   const checkmark = p.purchased ? ' ✅' : ''
   const bought = boughtQtyFor(event, p.id)
   const total = p.totalQuantity
-  const unit = displayUnit(p.unit, t)
+  const unit = displayUnit(p.unit, t, total)
   return `     • ${name}${assigneePart} · ${formatQty(bought)}/${formatQty(total)} ${unit}${checkmark}`
 }
 

src/presentation/utils/units.ts

@@ -5,7 +5,16 @@ export const SELECTABLE_UNITS = [...VALID_UNITS, SHARED_UNIT] as const
 
 const KNOWN = new Set<string>(SELECTABLE_UNITS)
 
-/** Translate a known unit key; fall back to the raw (free-text) unit otherwise. */
-export function displayUnit(unit: string, t: (key: string) => string): string {
-  return KNOWN.has(unit) ? t(`purchases.form.units.${unit}`) : unit
+type T = (key: string, opts?: Record<string, unknown>) => string
+
+/**
+ * Translate a known unit key, picking singular/plural based on `count` via i18next's
+ * built-in plural support (_one / _other suffixes). Falls back to the raw (free-text)
+ * unit otherwise. When `count` is omitted, returns the base plural form (used for
+ * dropdown labels).
+ */
+export function displayUnit(unit: string, t: T, count?: number): string {
+  if (!KNOWN.has(unit)) return unit
+  const key = `purchases.form.units.${unit}`
+  return count === undefined ? t(key) : t(key, { count })
 }

tests/presentation/utils/formatShoppingListText.test.ts

@@ -12,11 +12,11 @@ const STUB_TRANSLATIONS: Record<string, string> = {
   'purchases.form.units.single': 'single',
 }
 
-const t = (key: string, vars?: Record<string, string>): string => {
+const t = (key: string, vars?: Record<string, unknown>): string => {
   let value = STUB_TRANSLATIONS[key] ?? key
   if (vars) {
     for (const [k, v] of Object.entries(vars)) {
-      value = value.replace(`{{${k}}}`, v)
+      value = value.replace(`{{${k}}}`, String(v))
     }
   }
   return value