optional parameter for language, instead of rest parameter

website/src/routes/[[language]]/embed/+page.svelte

@@ -0,0 +1,27 @@
+<script lang="ts">
+	import { page } from '$app/stores';
+	import { onMount } from 'svelte';
+	import Embedding from '$lib/components/embedding/Embedding.svelte';
+	import {
+		getMergedEmbeddingOptions,
+		type EmbeddingOptions
+	} from '$lib/components/embedding/Embedding';
+
+	let embeddingOptions: EmbeddingOptions | undefined = undefined;
+
+	onMount(() => {
+		let options = $page.url.searchParams.get('options');
+		if (options === null) {
+			return;
+		}
+		options = JSON.parse(options);
+		if (options === null) {
+			return;
+		}
+		embeddingOptions = getMergedEmbeddingOptions(options);
+	});
+</script>
+
+{#if embeddingOptions}
+	<Embedding options={embeddingOptions} hash={$page.url.hash} />
+{/if}