optional parameter for language, instead of rest parameter

website/src/routes/[[language]]/help/[...guide]/+page.svelte

@@ -0,0 +1,36 @@
+<script lang="ts">
+	import { page } from '$app/stores';
+	import { getNextGuide, getPreviousGuide } from '$lib/components/docs/docs';
+	import DocsLoader from '$lib/components/docs/DocsLoader.svelte';
+	import { Button } from '$lib/components/ui/button';
+	import { getURLForLanguage } from '$lib/utils';
+	import { ChevronLeft, ChevronRight } from 'lucide-svelte';
+
+	$: previousGuide = getPreviousGuide($page.params.guide);
+	$: nextGuide = getNextGuide($page.params.guide);
+</script>
+
+<DocsLoader path="{$page.params.guide}.mdx" />
+
+<div class="flex flex-row flex-wrap gap-3 pt-6">
+	{#if previousGuide}
+		<Button
+			variant="outline"
+			class="mr-auto"
+			href={getURLForLanguage(undefined, `/help/${previousGuide}`)}
+		>
+			<ChevronLeft size="14" class="mr-1 mt-0.5" />
+			<DocsLoader path="{previousGuide}.mdx" titleOnly={true} />
+		</Button>
+	{/if}
+	{#if nextGuide}
+		<Button
+			variant="outline"
+			class="ml-auto"
+			href={getURLForLanguage(undefined, `/help/${nextGuide}`)}
+		>
+			<DocsLoader path="{nextGuide}.mdx" titleOnly={true} />
+			<ChevronRight size="14" class="ml-1 mt-0.5" />
+		</Button>
+	{/if}
+</div>