i18n(recipes): bootstrap namespace + migrate layout, NutritionSummary

Two-locale recipes dictionary lands at src/lib/i18n/recipes/{de,en}.ts
with the same satisfies-based completeness enforcement as the other
namespaces. recipesI18n.ts is the slim shim — exports m, RecipesLang,
RecipesKey, plus langFromRecipeSlug / recipeSlugFromLang helpers for
the rezepte ↔ recipes URL slug mapping.

[recipeLang]/+layout.svelte's nav-label ternary chain collapses into
t.foo lookups. NutritionSummary.svelte is the heavy hitter — 33
inline isEnglish ternaries become a single dictionary load. Most
amino-acid names use a German-stem-plus-optional-e pattern in the old
code (`Lysin{isEnglish ? 'e' : ''}`) that's now just t.lysine in the
template; less clever, much more obviously translatable.

src/lib/components/recipes/NutritionSummary.svelte

@@ -1,8 +1,12 @@
 <script>
 	import { createNutritionCalculator } from '$lib/js/nutrition.svelte';
 	import RingGraph from '$lib/components/fitness/RingGraph.svelte';
+	import { m } from '$lib/js/recipesI18n';
+	/** @typedef {import('$lib/js/recipesI18n').RecipesLang} RecipesLang */
 
 	let { flatIngredients, nutritionMappings, sectionNames, referencedNutrition, multiplier, portions, isEnglish, actions } = $props();
+	const lang = $derived(/** @type {RecipesLang} */ (isEnglish ? 'en' : 'de'));
+	const t = $derived(m[lang]);
 
 	const nutrition = createNutritionCalculator(
 		() => flatIngredients,
@@ -43,20 +47,20 @@
 	});
 
 	const labels = $derived({
-		title: isEnglish ? 'Nutrition' : 'Nährwerte',
-		perPortion: isEnglish ? 'per portion' : 'pro Portion',
-		protein: isEnglish ? 'Protein' : 'Eiweiß',
-		fat: isEnglish ? 'Fat' : 'Fett',
-		carbs: isEnglish ? 'Carbs' : 'Kohlenh.',
-		fiber: isEnglish ? 'Fiber' : 'Ballaststoffe',
-		sugars: isEnglish ? 'Sugars' : 'Zucker',
-		saturatedFat: isEnglish ? 'Sat. Fat' : 'Ges. Fett',
-		details: isEnglish ? 'Details' : 'Details',
-		vitamins: isEnglish ? 'Vitamins' : 'Vitamine',
-		minerals: isEnglish ? 'Minerals' : 'Mineralstoffe',
-		coverage: isEnglish ? 'coverage' : 'Abdeckung',
-		unmapped: isEnglish ? 'Not tracked' : 'Nicht erfasst',
-		aminoAcids: isEnglish ? 'Amino Acids' : 'Aminosäuren',
+		title: t.nutrition,
+		perPortion: t.per_portion,
+		protein: t.protein,
+		fat: t.fat,
+		carbs: t.carbs,
+		fiber: t.fiber,
+		sugars: t.sugars,
+		saturatedFat: t.saturated_fat,
+		details: t.details,
+		vitamins: t.vitamins,
+		minerals: t.minerals,
+		coverage: t.coverage,
+		unmapped: t.not_tracked,
+		aminoAcids: t.amino_acids
 	});
 
 	const hasAminoAcids = $derived.by(() => {
@@ -195,33 +199,33 @@
 			<div class="detail-section">
 				<h4>{labels.minerals}</h4>
 				<div class="detail-row"><span>Calcium</span><span>{fmt(nutrition.totalMicros.calcium / div)} mg</span></div>
-				<div class="detail-row"><span>{isEnglish ? 'Iron' : 'Eisen'}</span><span>{fmt(nutrition.totalMicros.iron / div)} mg</span></div>
+				<div class="detail-row"><span>{t.iron}</span><span>{fmt(nutrition.totalMicros.iron / div)} mg</span></div>
 				<div class="detail-row"><span>Magnesium</span><span>{fmt(nutrition.totalMicros.magnesium / div)} mg</span></div>
 				<div class="detail-row"><span>Potassium</span><span>{fmt(nutrition.totalMicros.potassium / div)} mg</span></div>
 				<div class="detail-row"><span>Sodium</span><span>{fmt(nutrition.totalMicros.sodium / div)} mg</span></div>
-				<div class="detail-row"><span>{isEnglish ? 'Zinc' : 'Zink'}</span><span>{fmt(nutrition.totalMicros.zinc / div)} mg</span></div>
+				<div class="detail-row"><span>{t.zinc}</span><span>{fmt(nutrition.totalMicros.zinc / div)} mg</span></div>
 			</div>
 			{#if hasAminoAcids}
 			<div class="detail-section">
 				<h4>{labels.aminoAcids}</h4>
-				<div class="detail-row"><span>{isEnglish ? 'Leucine' : 'Leucin'}</span><span>{fmt(nutrition.totalAminoAcids.leucine / div)} g</span></div>
-				<div class="detail-row"><span>{isEnglish ? 'Isoleucine' : 'Isoleucin'}</span><span>{fmt(nutrition.totalAminoAcids.isoleucine / div)} g</span></div>
-				<div class="detail-row"><span>Valin{isEnglish ? 'e' : ''}</span><span>{fmt(nutrition.totalAminoAcids.valine / div)} g</span></div>
-				<div class="detail-row"><span>Lysin{isEnglish ? 'e' : ''}</span><span>{fmt(nutrition.totalAminoAcids.lysine / div)} g</span></div>
-				<div class="detail-row"><span>Methionin{isEnglish ? 'e' : ''}</span><span>{fmt(nutrition.totalAminoAcids.methionine / div)} g</span></div>
-				<div class="detail-row"><span>Phenylalanin{isEnglish ? 'e' : ''}</span><span>{fmt(nutrition.totalAminoAcids.phenylalanine / div)} g</span></div>
-				<div class="detail-row"><span>Threonin{isEnglish ? 'e' : ''}</span><span>{fmt(nutrition.totalAminoAcids.threonine / div)} g</span></div>
+				<div class="detail-row"><span>{t.leucine}</span><span>{fmt(nutrition.totalAminoAcids.leucine / div)} g</span></div>
+				<div class="detail-row"><span>{t.isoleucine}</span><span>{fmt(nutrition.totalAminoAcids.isoleucine / div)} g</span></div>
+				<div class="detail-row"><span>{t.valine}</span><span>{fmt(nutrition.totalAminoAcids.valine / div)} g</span></div>
+				<div class="detail-row"><span>{t.lysine}</span><span>{fmt(nutrition.totalAminoAcids.lysine / div)} g</span></div>
+				<div class="detail-row"><span>{t.methionine}</span><span>{fmt(nutrition.totalAminoAcids.methionine / div)} g</span></div>
+				<div class="detail-row"><span>{t.phenylalanine}</span><span>{fmt(nutrition.totalAminoAcids.phenylalanine / div)} g</span></div>
+				<div class="detail-row"><span>{t.threonine}</span><span>{fmt(nutrition.totalAminoAcids.threonine / div)} g</span></div>
 				<div class="detail-row"><span>Tryptophan</span><span>{fmt(nutrition.totalAminoAcids.tryptophan / div)} g</span></div>
-				<div class="detail-row"><span>Histidin{isEnglish ? 'e' : ''}</span><span>{fmt(nutrition.totalAminoAcids.histidine / div)} g</span></div>
-				<div class="detail-row"><span>Arginin{isEnglish ? 'e' : ''}</span><span>{fmt(nutrition.totalAminoAcids.arginine / div)} g</span></div>
-				<div class="detail-row"><span>Alanin{isEnglish ? 'e' : ''}</span><span>{fmt(nutrition.totalAminoAcids.alanine / div)} g</span></div>
-				<div class="detail-row"><span>{isEnglish ? 'Aspartic Acid' : 'Asparaginsäure'}</span><span>{fmt(nutrition.totalAminoAcids.asparticAcid / div)} g</span></div>
-				<div class="detail-row"><span>{isEnglish ? 'Cysteine' : 'Cystein'}</span><span>{fmt(nutrition.totalAminoAcids.cysteine / div)} g</span></div>
-				<div class="detail-row"><span>{isEnglish ? 'Glutamic Acid' : 'Glutaminsäure'}</span><span>{fmt(nutrition.totalAminoAcids.glutamicAcid / div)} g</span></div>
-				<div class="detail-row"><span>Glycin{isEnglish ? 'e' : ''}</span><span>{fmt(nutrition.totalAminoAcids.glycine / div)} g</span></div>
-				<div class="detail-row"><span>Prolin{isEnglish ? 'e' : ''}</span><span>{fmt(nutrition.totalAminoAcids.proline / div)} g</span></div>
-				<div class="detail-row"><span>Serin{isEnglish ? 'e' : ''}</span><span>{fmt(nutrition.totalAminoAcids.serine / div)} g</span></div>
-				<div class="detail-row"><span>Tyrosin{isEnglish ? 'e' : ''}</span><span>{fmt(nutrition.totalAminoAcids.tyrosine / div)} g</span></div>
+				<div class="detail-row"><span>{t.histidine}</span><span>{fmt(nutrition.totalAminoAcids.histidine / div)} g</span></div>
+				<div class="detail-row"><span>{t.arginine}</span><span>{fmt(nutrition.totalAminoAcids.arginine / div)} g</span></div>
+				<div class="detail-row"><span>{t.alanine}</span><span>{fmt(nutrition.totalAminoAcids.alanine / div)} g</span></div>
+				<div class="detail-row"><span>{t.aspartic_acid}</span><span>{fmt(nutrition.totalAminoAcids.asparticAcid / div)} g</span></div>
+				<div class="detail-row"><span>{t.cysteine}</span><span>{fmt(nutrition.totalAminoAcids.cysteine / div)} g</span></div>
+				<div class="detail-row"><span>{t.glutamic_acid}</span><span>{fmt(nutrition.totalAminoAcids.glutamicAcid / div)} g</span></div>
+				<div class="detail-row"><span>{t.glycine}</span><span>{fmt(nutrition.totalAminoAcids.glycine / div)} g</span></div>
+				<div class="detail-row"><span>{t.proline}</span><span>{fmt(nutrition.totalAminoAcids.proline / div)} g</span></div>
+				<div class="detail-row"><span>{t.serine}</span><span>{fmt(nutrition.totalAminoAcids.serine / div)} g</span></div>
+				<div class="detail-row"><span>{t.tyrosine}</span><span>{fmt(nutrition.totalAminoAcids.tyrosine / div)} g</span></div>
 			</div>
 			{/if}
 		</div>

src/lib/i18n/recipes/de.ts

@@ -0,0 +1,46 @@
+/** German recipes UI strings — source of truth for the key set. */
+
+export const de = {
+	// Layout / nav
+	all_recipes: 'Alle Rezepte',
+	favorites: 'Favoriten',
+	season_nav: 'Saison',
+	category_nav: 'Kategorie',
+	icon_nav: 'Icon',
+	tags_nav: 'Tags',
+
+	// Nutrition summary
+	nutrition: 'Nährwerte',
+	per_portion: 'pro Portion',
+	protein: 'Eiweiß',
+	fat: 'Fett',
+	carbs: 'Kohlenh.',
+	fiber: 'Ballaststoffe',
+	sugars: 'Zucker',
+	saturated_fat: 'Ges. Fett',
+	details: 'Details',
+	vitamins: 'Vitamine',
+	minerals: 'Mineralstoffe',
+	coverage: 'Abdeckung',
+	not_tracked: 'Nicht erfasst',
+	amino_acids: 'Aminosäuren',
+	iron: 'Eisen',
+	zinc: 'Zink',
+	leucine: 'Leucin',
+	isoleucine: 'Isoleucin',
+	valine: 'Valin',
+	lysine: 'Lysin',
+	methionine: 'Methionin',
+	phenylalanine: 'Phenylalanin',
+	threonine: 'Threonin',
+	histidine: 'Histidin',
+	arginine: 'Arginin',
+	alanine: 'Alanin',
+	aspartic_acid: 'Asparaginsäure',
+	cysteine: 'Cystein',
+	glutamic_acid: 'Glutaminsäure',
+	glycine: 'Glycin',
+	proline: 'Prolin',
+	serine: 'Serin',
+	tyrosine: 'Tyrosin'
+} as const;

src/lib/i18n/recipes/en.ts

@@ -0,0 +1,46 @@
+import type { de } from './de';
+
+export const en = {
+	// Layout / nav
+	all_recipes: 'All Recipes',
+	favorites: 'Favorites',
+	season_nav: 'Season',
+	category_nav: 'Category',
+	icon_nav: 'Icon',
+	tags_nav: 'Tags',
+
+	// Nutrition summary
+	nutrition: 'Nutrition',
+	per_portion: 'per portion',
+	protein: 'Protein',
+	fat: 'Fat',
+	carbs: 'Carbs',
+	fiber: 'Fiber',
+	sugars: 'Sugars',
+	saturated_fat: 'Sat. Fat',
+	details: 'Details',
+	vitamins: 'Vitamins',
+	minerals: 'Minerals',
+	coverage: 'coverage',
+	not_tracked: 'Not tracked',
+	amino_acids: 'Amino Acids',
+	iron: 'Iron',
+	zinc: 'Zinc',
+	leucine: 'Leucine',
+	isoleucine: 'Isoleucine',
+	valine: 'Valine',
+	lysine: 'Lysine',
+	methionine: 'Methionine',
+	phenylalanine: 'Phenylalanine',
+	threonine: 'Threonine',
+	histidine: 'Histidine',
+	arginine: 'Arginine',
+	alanine: 'Alanine',
+	aspartic_acid: 'Aspartic Acid',
+	cysteine: 'Cysteine',
+	glutamic_acid: 'Glutamic Acid',
+	glycine: 'Glycine',
+	proline: 'Proline',
+	serine: 'Serine',
+	tyrosine: 'Tyrosine'
+} as const satisfies Record<keyof typeof de, string>;

src/lib/js/recipesI18n.ts

@@ -0,0 +1,39 @@
+/**
+ * Recipes route i18n.
+ *
+ * Translation tables live per-locale in `$lib/i18n/recipes/{de,en}.ts`.
+ * `de.ts` is the source of truth for the key set; `en.ts` uses
+ * `satisfies Record<keyof typeof de, string>` so missing translations
+ * fail the build.
+ *
+ * Recipes routes get `lang` from the layout server load (data.lang),
+ * derived from the [recipeLang=recipeLang] param matcher: rezepte→de,
+ * recipes→en. Use `langFromRecipeSlug(params.recipeLang)` if you need it
+ * from the slug directly.
+ */
+
+import { de } from '$lib/i18n/recipes/de';
+import { en } from '$lib/i18n/recipes/en';
+
+export const m = { de, en } as const;
+
+export type RecipesLang = keyof typeof m;
+export type RecipesKey = keyof typeof de;
+
+/** Map a `[recipeLang]` slug to the locale code. */
+export function langFromRecipeSlug(recipeLang: string | null | undefined): RecipesLang {
+	return recipeLang === 'recipes' ? 'en' : 'de';
+}
+
+/** Reverse: locale → URL slug. */
+export function recipeSlugFromLang(lang: RecipesLang): 'recipes' | 'rezepte' {
+	return lang === 'en' ? 'recipes' : 'rezepte';
+}
+
+/**
+ * Get a translated string. Prefer `m[lang].key` directly in new code —
+ * this helper is kept for incremental migration.
+ */
+export function t(key: RecipesKey, lang: RecipesLang): string {
+	return m[lang][key] ?? m.en[key] ?? key;
+}

src/routes/[recipeLang=recipeLang]/+layout.svelte

@@ -56,14 +56,18 @@ let { data, children } = $props();
 
 let user = $derived(data.session?.user);
 
-const isEnglish = $derived(data.lang === 'en');
+import { m } from '$lib/js/recipesI18n';
+/** @typedef {import('$lib/js/recipesI18n').RecipesLang} RecipesLang */
+const lang = $derived(/** @type {RecipesLang} */ (data.lang));
+const t = $derived(m[lang]);
+const isEnglish = $derived(lang === 'en');
 const labels = $derived({
-	allRecipes: isEnglish ? 'All Recipes' : 'Alle Rezepte',
-	favorites: isEnglish ? 'Favorites' : 'Favoriten',
-	inSeason: isEnglish ? 'Season' : 'Saison',
-	category: isEnglish ? 'Category' : 'Kategorie',
-	icon: 'Icon',
-	keywords: 'Tags'
+	allRecipes: t.all_recipes,
+	favorites: t.favorites,
+	inSeason: t.season_nav,
+	category: t.category_nav,
+	icon: t.icon_nav,
+	keywords: t.tags_nav
 });
 
 /** @param {string} path */