add bilingual labels to recipe components and fix language switcher

- Translate hardcoded German terms in IngredientsPage and InstructionsPage
- Migrate both components to Svelte 5 runes (, , )
- Fix language switcher to use correct short names via shared store
- Add recipeTranslationStore for recipe-specific language switching

src/lib/components/IngredientsPage.svelte

@@ -4,13 +4,20 @@ import { onNavigate } from "$app/navigation";
 import { browser } from '$app/environment';
 import { page } from '$app/stores';
 import HefeSwapper from './HefeSwapper.svelte';
-export let data
+
-let multiplier = data.multiplier || 1;
+let { data } = $props();
+let multiplier = $state(data.multiplier || 1);
+
+const isEnglish = $derived(data.lang === 'en');
+const labels = $derived({
+	portions: isEnglish ? 'Portions:' : 'Portionen:',
+	adjustAmount: isEnglish ? 'Adjust Amount:' : 'Menge anpassen:',
+	ingredients: isEnglish ? 'Ingredients' : 'Zutaten'
+});
 
 // Calculate yeast IDs for each yeast ingredient
-let yeastIds = {};
+const yeastIds = $derived.by(() => {
-$: {
+	const ids = {};
-	yeastIds = {};
 	let yeastCounter = 0;
 	if (data.ingredients) {
 		for (let listIndex = 0; listIndex < data.ingredients.length; listIndex++) {
@@ -18,17 +25,19 @@ $: {
 			if (list.list) {
 				for (let ingredientIndex = 0; ingredientIndex < list.list.length; ingredientIndex++) {
 					const ingredient = list.list[ingredientIndex];
-					if (ingredient.name === "Frischhefe" || ingredient.name === "Trockenhefe") {
+					if (ingredient.name === "Frischhefe" || ingredient.name === "Trockenhefe" ||
-						yeastIds[`${listIndex}-${ingredientIndex}`] = yeastCounter++;
+					    ingredient.name === "Fresh Yeast" || ingredient.name === "Dry Yeast") {
-					}
+						ids[`${listIndex}-${ingredientIndex}`] = yeastCounter++;
 					}
 				}
 			}
 		}
 	}
+	return ids;
+});
 
 // Get all current URL parameters to preserve state in multiplier forms
-$: currentParams = browser ? new URLSearchParams(window.location.search) : $page.url.searchParams;
+const currentParams = $derived(browser ? new URLSearchParams(window.location.search) : $page.url.searchParams);
 
 // Progressive enhancement - use JS if available
 onMount(() => {
@@ -318,11 +327,11 @@ span
 {#if data.ingredients}
 <div class=ingredients>
 {#if data.portions}
-	<h3>Portionen:</h3>
+	<h3>{labels.portions}</h3>
 	{@html convertFloatsToFractions(multiplyFirstAndSecondNumbers(data.portions, multiplier))}
 {/if}
 
-<h3>Menge anpassen:</h3>
+<h3>{labels.adjustAmount}</h3>
 <div class=multipliers>
 	<form method="get" style="display: inline;">
 		<input type="hidden" name="multiplier" value="0.5" />
@@ -389,7 +398,7 @@ span
 	</form>
 </div>
 
-<h2>Zutaten</h2>
+<h2>{labels.ingredients}</h2>
 {#each data.ingredients as list, listIndex}
 {#if list.name}
 	<h3>{list.name}</h3>
@@ -399,7 +408,7 @@ span
 		<div class=amount>{@html adjust_amount(item.amount, multiplier)} {item.unit}</div>
 		<div class=name>
 			{@html item.name.replace("{{multiplier}}", isNaN(parseFloat(item.amount)) ? multiplier : multiplier * parseFloat(item.amount))}
-			{#if item.name === "Frischhefe" || item.name === "Trockenhefe"}
+			{#if item.name === "Frischhefe" || item.name === "Trockenhefe" || item.name === "Fresh Yeast" || item.name === "Dry Yeast"}
 				{@const yeastId = yeastIds[`${listIndex}-${ingredientIndex}`] ?? 0}
 				<HefeSwapper {item} {multiplier} {yeastId} />
 			{/if}

src/lib/components/InstructionsPage.svelte

@@ -1,5 +1,17 @@
 <script>
-export let data
+let { data } = $props();
+
+const isEnglish = $derived(data.lang === 'en');
+const labels = $derived({
+	preparation: isEnglish ? 'Preparation:' : 'Vorbereitung:',
+	bulkFermentation: isEnglish ? 'Bulk Fermentation:' : 'Stockgare:',
+	finalProof: isEnglish ? 'Final Proof:' : 'Stückgare:',
+	baking: isEnglish ? 'Baking:' : 'Backen:',
+	cooking: isEnglish ? 'Cooking:' : 'Kochen:',
+	onThePlate: isEnglish ? 'On the Plate:' : 'Auf dem Teller:',
+	instructions: isEnglish ? 'Instructions' : 'Zubereitung',
+	at: isEnglish ? 'at' : 'bei'
+});
 </script>
 <style>
 *{
@@ -59,35 +71,35 @@ h4{
 <div class=instructions>
 <div class=additional_info>
 {#if data.preparation}
-<div><h4>Vorbereitung:</h4>{data.preparation}</div>
+<div><h4>{labels.preparation}</h4>{data.preparation}</div>
 {/if}
 
 
 {#if data.fermentation}
 	{#if data.fermentation.bulk}
-		<div><h4>Stockgare:</h4>{data.fermentation.bulk}</div>
+		<div><h4>{labels.bulkFermentation}</h4>{data.fermentation.bulk}</div>
 	{/if}
 
 	{#if data.fermentation.final}
-		<div><h4>Stückgare:</h4> {data.fermentation.final}</div>
+		<div><h4>{labels.finalProof}</h4> {data.fermentation.final}</div>
 	{/if}
 {/if}
 
 {#if data.baking.temperature}
-<div><h4>Backen:</h4> {data.baking.length} bei {data.baking.temperature} °C {data.baking.mode}</div>
+<div><h4>{labels.baking}</h4> {data.baking.length} {labels.at} {data.baking.temperature} °C {data.baking.mode}</div>
 {/if}
 
 {#if data.cooking}
-<div><h4>Kochen:</h4>{data.cooking}</div>
+<div><h4>{labels.cooking}</h4>{data.cooking}</div>
 {/if}
 
 {#if data.total_time}
-<div><h4>Auf dem Teller:</h4>{data.total_time}</div>
+<div><h4>{labels.onThePlate}</h4>{data.total_time}</div>
 {/if}
 </div>
 
 {#if data.instructions}
-<h2>Zubereitung</h2>
+<h2>{labels.instructions}</h2>
 {#each data.instructions as list}
 {#if list.name}
 	<h3>{list.name}</h3>

src/lib/components/UserHeader.svelte

@@ -2,6 +2,8 @@
 	import { onMount } from "svelte";
 	import { goto } from '$app/navigation';
 	import { page } from '$app/stores';
+	import { recipeTranslationStore } from '$lib/stores/recipeTranslation';
+
 	let { user, showLanguageSelector = false } = $props();
 
 	let currentLang = $state('de');
@@ -42,7 +44,19 @@
 		// Get the current path directly from window
 		const path = typeof window !== 'undefined' ? window.location.pathname : currentPath;
 
-		// Convert current path to target language
+		// If we have recipe translation data from store, use the correct short names
+		const recipeData = $recipeTranslationStore;
+		if (recipeData) {
+			if (lang === 'en' && recipeData.englishShortName) {
+				goto(`/recipes/${recipeData.englishShortName}`);
+				return;
+			} else if (lang === 'de' && recipeData.germanShortName) {
+				goto(`/rezepte/${recipeData.germanShortName}`);
+				return;
+			}
+		}
+
+		// Convert current path to target language (for non-recipe pages)
 		let newPath = path;
 		if (lang === 'en' && path.startsWith('/rezepte')) {
 			newPath = path.replace('/rezepte', '/recipes');

src/lib/stores/recipeTranslation.ts

@@ -0,0 +1,9 @@
+import { writable } from 'svelte/store';
+
+interface RecipeTranslationData {
+	germanShortName: string;
+	englishShortName?: string;
+	hasEnglishTranslation: boolean;
+}
+
+export const recipeTranslationStore = writable<RecipeTranslationData | null>(null);

src/routes/[recipeLang]/[name]/+page.svelte

@@ -14,9 +14,25 @@
 	import {stripHtmlTags} from '$lib/js/stripHtmlTags';
 	import FavoriteButton from '$lib/components/FavoriteButton.svelte';
 	import RecipeLanguageSwitcher from '$lib/components/RecipeLanguageSwitcher.svelte';
+	import { onMount, onDestroy } from 'svelte';
+	import { recipeTranslationStore } from '$lib/stores/recipeTranslation';
 
     	let { data }: { data: PageData } = $props();
 
+	// Set store for recipe translation data so UserHeader can access it
+	onMount(() => {
+		recipeTranslationStore.set({
+			germanShortName: data.germanShortName || data.short_name,
+			englishShortName: data.englishShortName,
+			hasEnglishTranslation: data.hasEnglishTranslation || false
+		});
+	});
+
+	// Clear store when leaving recipe page
+	onDestroy(() => {
+		recipeTranslationStore.set(null);
+	});
+
 	const isEnglish = $derived(data.lang === 'en');
 
 	// Use German short_name for images (they're the same for both languages)