frontend/messages/de.json

@@ -633,6 +633,9 @@
 	"transcription_block_review": "Als geprüft markieren",
 	"transcription_block_unreview": "Markierung aufheben",
 	"transcription_reviewed_count": "{reviewed} von {total} geprüft",
+	"transcription_mark_all_reviewed": "Alle als fertig markieren",
+	"transcription_mark_all_reviewed_disabled": "Alle Blöcke sind bereits als fertig markiert",
+	"transcription_mark_all_reviewed_error": "Markierung fehlgeschlagen. Bitte versuchen Sie es erneut.",
 	"training_ocr_heading": "Kurrent-Erkennung trainieren",
 	"training_ocr_description": "Starte ein neues Training mit den bisher geprüften OCR-Blöcken, um die Erkennungsgenauigkeit für Kurrentschrift zu verbessern.",
 	"training_ocr_blocks_ready": "{blocks} geprüfte Blöcke bereit / {docs} Dokumente",

frontend/messages/en.json

@@ -633,6 +633,9 @@
 	"transcription_block_review": "Mark as reviewed",
 	"transcription_block_unreview": "Unmark as reviewed",
 	"transcription_reviewed_count": "{reviewed} of {total} reviewed",
+	"transcription_mark_all_reviewed": "Mark all as reviewed",
+	"transcription_mark_all_reviewed_disabled": "All blocks are already marked as reviewed",
+	"transcription_mark_all_reviewed_error": "Failed to mark all as reviewed. Please try again.",
 	"training_ocr_heading": "Train Kurrent recognition",
 	"training_ocr_description": "Start a new training run using the reviewed OCR blocks to improve recognition accuracy for Kurrent script.",
 	"training_ocr_blocks_ready": "{blocks} reviewed blocks ready / {docs} documents",

frontend/messages/es.json

@@ -633,6 +633,9 @@
 	"transcription_block_review": "Marcar como revisado",
 	"transcription_block_unreview": "Desmarcar como revisado",
 	"transcription_reviewed_count": "{reviewed} de {total} revisados",
+	"transcription_mark_all_reviewed": "Marcar todo como revisado",
+	"transcription_mark_all_reviewed_disabled": "Todos los bloques ya están marcados como revisados",
+	"transcription_mark_all_reviewed_error": "Error al marcar como revisado. Intente de nuevo.",
 	"training_ocr_heading": "Entrenar reconocimiento Kurrent",
 	"training_ocr_description": "Inicia un nuevo entrenamiento con los bloques OCR revisados para mejorar la precisión de reconocimiento del script Kurrent.",
 	"training_ocr_blocks_ready": "{blocks} bloques revisados listos / {docs} documentos",

frontend/src/lib/document/transcription/TranscriptionEditView.svelte

@@ -49,6 +49,7 @@ let activeBlockId: string | null = $state(null);
 let localLabels: string[] = $derived.by(() => [...trainingLabels]);
 let listEl: HTMLElement | null = $state(null);
 let markingAllReviewed = $state(false);
+let markAllError = $state<string | null>(null);
 
 const sortedBlocks = $derived([...blocks].sort((a, b) => a.sortOrder - b.sortOrder));
 const hasBlocks = $derived(blocks.length > 0);
@@ -67,8 +68,11 @@ $effect(() => {
 async function handleMarkAllReviewed() {
 	if (!onMarkAllReviewed) return;
 	markingAllReviewed = true;
+	markAllError = null;
 	try {
 		await onMarkAllReviewed();
+	} catch {
+		markAllError = m.transcription_mark_all_reviewed_error();
 	} finally {
 		markingAllReviewed = false;
 	}
@@ -169,7 +173,7 @@ async function handleLabelToggle(label: string) {
 					<button
 						onclick={handleMarkAllReviewed}
 						disabled={allReviewed || markingAllReviewed}
-						title={allReviewed ? 'Alle Blöcke sind bereits als fertig markiert' : undefined}
+						title={allReviewed ? m.transcription_mark_all_reviewed_disabled() : undefined}
 						class="flex min-h-[44px] items-center gap-1.5 rounded-sm px-3 font-sans text-xs font-medium text-brand-navy/80 transition-colors hover:text-brand-navy focus-visible:ring-2 focus-visible:ring-brand-navy disabled:opacity-40"
 					>
 						{#if markingAllReviewed}
@@ -207,7 +211,7 @@ async function handleLabelToggle(label: string) {
 								<path stroke-linecap="round" stroke-linejoin="round" d="M5 13l4 4L19 7" />
 							</svg>
 						{/if}
-						Alle als fertig markieren
+						{m.transcription_mark_all_reviewed()}
 					</button>
 				{/if}
 			</div>
@@ -217,6 +221,31 @@ async function handleLabelToggle(label: string) {
 					style="width: {reviewProgress}%"
 				></div>
 			</div>
+			{#if markAllError}
+				<div
+					role="alert"
+					class="mt-1.5 flex items-center gap-2 rounded-sm border border-red-200 bg-red-50 px-3 py-2 font-sans text-sm text-red-700"
+				>
+					<span class="flex-1">{markAllError}</span>
+					<button
+						onclick={() => (markAllError = null)}
+						aria-label={m.comp_dismiss()}
+						class="flex min-h-[44px] min-w-[44px] items-center justify-center rounded text-red-600 hover:text-red-700 focus-visible:ring-2 focus-visible:ring-red-500"
+					>
+						<svg
+							class="h-4 w-4"
+							fill="none"
+							stroke="currentColor"
+							stroke-width="2"
+							viewBox="0 0 24 24"
+							xmlns="http://www.w3.org/2000/svg"
+							aria-hidden="true"
+						>
+							<path stroke-linecap="round" stroke-linejoin="round" d="M6 18L18 6M6 6l12 12" />
+						</svg>
+					</button>
+				</div>
+			{/if}
 		</div>
 		<div class="p-4">
 			<!-- svelte-ignore a11y_no_static_element_interactions -->

frontend/src/lib/document/transcription/TranscriptionEditView.svelte.spec.ts

@@ -3,6 +3,7 @@ import { cleanup, render } from 'vitest-browser-svelte';
 import { page, userEvent } from 'vitest/browser';
 import TranscriptionEditView from './TranscriptionEditView.svelte';
 import { createConfirmService, CONFIRM_KEY } from '$lib/shared/services/confirm.svelte.js';
+import { m } from '$lib/paraglide/messages.js';
 
 afterEach(cleanup);
 
@@ -312,14 +313,14 @@ describe('TranscriptionEditView — mark all reviewed', () => {
 			onMarkAllReviewed: vi.fn().mockResolvedValue(undefined)
 		});
 		await expect
-			.element(page.getByRole('button', { name: /Alle als fertig markieren/ }))
+			.element(page.getByRole('button', { name: m.transcription_mark_all_reviewed() }))
 			.toBeInTheDocument();
 	});
 
 	it('does not show "Alle als fertig markieren" button when onMarkAllReviewed is not provided', async () => {
 		renderView({ blocks: [unreviewedBlock1, unreviewedBlock2] });
 		await expect
-			.element(page.getByRole('button', { name: /Alle als fertig markieren/ }))
+			.element(page.getByRole('button', { name: m.transcription_mark_all_reviewed() }))
 			.not.toBeInTheDocument();
 	});
 
@@ -329,7 +330,7 @@ describe('TranscriptionEditView — mark all reviewed', () => {
 			onMarkAllReviewed: vi.fn().mockResolvedValue(undefined)
 		});
 		await expect
-			.element(page.getByRole('button', { name: /Alle als fertig markieren/ }))
+			.element(page.getByRole('button', { name: m.transcription_mark_all_reviewed() }))
 			.toBeDisabled();
 	});
 
@@ -343,7 +344,7 @@ describe('TranscriptionEditView — mark all reviewed', () => {
 		// userEvent.click() via Playwright CDP doesn't reliably trigger Svelte 5 onclick
 		// handlers when a TipTap editor is mounted in the same component tree.
 		const btn = (await page
-			.getByRole('button', { name: /Alle als fertig markieren/ })
+			.getByRole('button', { name: m.transcription_mark_all_reviewed() })
 			.element()) as HTMLButtonElement;
 		btn.dispatchEvent(new MouseEvent('click', { bubbles: true, cancelable: true }));
 		await vi.waitFor(() => expect(onMarkAllReviewed).toHaveBeenCalledTimes(1));
@@ -361,12 +362,83 @@ describe('TranscriptionEditView — mark all reviewed', () => {
 
 		// Same CDP click workaround: dispatch from browser JS to reliably fire Svelte 5 onclick
 		const btnEl = (await page
-			.getByRole('button', { name: /Alle als fertig markieren/ })
+			.getByRole('button', { name: m.transcription_mark_all_reviewed() })
 			.element()) as HTMLButtonElement;
 		btnEl.dispatchEvent(new MouseEvent('click', { bubbles: true, cancelable: true }));
 		await expect
-			.element(page.getByRole('button', { name: /Alle als fertig markieren/ }))
+			.element(page.getByRole('button', { name: m.transcription_mark_all_reviewed() }))
 			.toBeDisabled();
 		resolveMarkAll();
 	});
+
+	it('shows error message when onMarkAllReviewed callback rejects', async () => {
+		const onMarkAllReviewed = vi.fn().mockRejectedValue(new Error('INTERNAL_ERROR'));
+		renderView({ blocks: [unreviewedBlock1, unreviewedBlock2], onMarkAllReviewed });
+
+		const btnEl = (await page
+			.getByRole('button', { name: m.transcription_mark_all_reviewed() })
+			.element()) as HTMLButtonElement;
+		btnEl.dispatchEvent(new MouseEvent('click', { bubbles: true, cancelable: true }));
+
+		await expect.element(page.getByRole('alert')).toBeInTheDocument();
+		await expect
+			.element(page.getByRole('alert'))
+			.toHaveTextContent(m.transcription_mark_all_reviewed_error());
+	});
+
+	it('clears error when dismiss button is clicked', async () => {
+		const onMarkAllReviewed = vi.fn().mockRejectedValue(new Error('INTERNAL_ERROR'));
+		renderView({ blocks: [unreviewedBlock1, unreviewedBlock2], onMarkAllReviewed });
+
+		const btnEl = (await page
+			.getByRole('button', { name: m.transcription_mark_all_reviewed() })
+			.element()) as HTMLButtonElement;
+		btnEl.dispatchEvent(new MouseEvent('click', { bubbles: true, cancelable: true }));
+		await expect.element(page.getByRole('alert')).toBeInTheDocument();
+
+		const dismissEl = (await page
+			.getByRole('button', { name: m.comp_dismiss() })
+			.element()) as HTMLButtonElement;
+		dismissEl.dispatchEvent(new MouseEvent('click', { bubbles: true, cancelable: true }));
+
+		await expect.element(page.getByRole('alert')).not.toBeInTheDocument();
+	});
+
+	it('clears error on next successful markAllReviewed call', async () => {
+		const onMarkAllReviewed = vi
+			.fn()
+			.mockRejectedValueOnce(new Error('INTERNAL_ERROR'))
+			.mockResolvedValue(undefined);
+		renderView({ blocks: [unreviewedBlock1, unreviewedBlock2], onMarkAllReviewed });
+
+		const btnEl = (await page
+			.getByRole('button', { name: m.transcription_mark_all_reviewed() })
+			.element()) as HTMLButtonElement;
+		btnEl.dispatchEvent(new MouseEvent('click', { bubbles: true, cancelable: true }));
+		await expect.element(page.getByRole('alert')).toBeInTheDocument();
+		// Wait for the button to be re-enabled before the second click — ensures the first
+		// async rejection has fully settled and Svelte has flushed state changes
+		await expect
+			.element(page.getByRole('button', { name: m.transcription_mark_all_reviewed() }))
+			.not.toBeDisabled();
+
+		btnEl.dispatchEvent(new MouseEvent('click', { bubbles: true, cancelable: true }));
+
+		await expect.element(page.getByRole('alert')).not.toBeInTheDocument();
+	});
+
+	it('re-enables button after markAllReviewed failure', async () => {
+		const onMarkAllReviewed = vi.fn().mockRejectedValue(new Error('INTERNAL_ERROR'));
+		renderView({ blocks: [unreviewedBlock1, unreviewedBlock2], onMarkAllReviewed });
+
+		const btnEl = (await page
+			.getByRole('button', { name: m.transcription_mark_all_reviewed() })
+			.element()) as HTMLButtonElement;
+		btnEl.dispatchEvent(new MouseEvent('click', { bubbles: true, cancelable: true }));
+		await expect.element(page.getByRole('alert')).toBeInTheDocument();
+
+		await expect
+			.element(page.getByRole('button', { name: m.transcription_mark_all_reviewed() }))
+			.not.toBeDisabled();
+	});
 });

frontend/src/lib/document/transcription/useTranscriptionBlocks.svelte.test.ts

@@ -259,12 +259,15 @@ describe('createTranscriptionBlocks.markAllReviewed', () => {
 		expect(ctrl.blocks.every((b) => b.reviewed)).toBe(true);
 	});
 
-	it('is a no-op when PUT returns non-OK', async () => {
+	it('throws and leaves blocks unchanged when PUT returns non-OK', async () => {
 		const fetchImpl = vi.fn(async (url: RequestInfo | URL, init?: RequestInit) => {
 			const u = url.toString();
 			const method = init?.method ?? 'GET';
 			if (u.includes('/review-all') && method === 'PUT') {
-				return new Response('', { status: 500 });
+				return new Response(JSON.stringify({ code: 'INTERNAL_ERROR' }), {
+					status: 500,
+					headers: { 'Content-Type': 'application/json' }
+				});
 			}
 			return new Response(JSON.stringify([baseBlock({ id: 'b-1', reviewed: false })]), {
 				status: 200,
@@ -274,7 +277,26 @@ describe('createTranscriptionBlocks.markAllReviewed', () => {
 
 		const ctrl = createTranscriptionBlocks({ documentId: () => 'doc-1', fetchImpl });
 		await ctrl.load();
-		await ctrl.markAllReviewed();
+		await expect(ctrl.markAllReviewed()).rejects.toThrow('INTERNAL_ERROR');
+		expect(ctrl.blocks[0].reviewed).toBe(false);
+	});
+
+	it('throws INTERNAL_ERROR when PUT returns non-JSON body (e.g. nginx 502)', async () => {
+		const fetchImpl = vi.fn(async (url: RequestInfo | URL, init?: RequestInit) => {
+			const u = url.toString();
+			const method = init?.method ?? 'GET';
+			if (u.includes('/review-all') && method === 'PUT') {
+				return new Response('Bad Gateway', { status: 502 });
+			}
+			return new Response(JSON.stringify([baseBlock({ id: 'b-1', reviewed: false })]), {
+				status: 200,
+				headers: { 'Content-Type': 'application/json' }
+			});
+		});
+
+		const ctrl = createTranscriptionBlocks({ documentId: () => 'doc-1', fetchImpl });
+		await ctrl.load();
+		await expect(ctrl.markAllReviewed()).rejects.toThrow('INTERNAL_ERROR');
 		expect(ctrl.blocks[0].reviewed).toBe(false);
 	});
 });

frontend/src/lib/document/transcription/useTranscriptionBlocks.svelte.ts

@@ -119,7 +119,11 @@ export function createTranscriptionBlocks(
 		const res = await fetchImpl(`/api/documents/${documentId()}/transcription-blocks/review-all`, {
 			method: 'PUT'
 		});
-		if (!res.ok) return;
+		if (!res.ok) {
+			const body = await res.json().catch(() => ({}));
+			// Never render body.message — route through getErrorMessage() to prevent leaking backend internals
+			throw new Error((body as { code?: string })?.code ?? 'INTERNAL_ERROR');
+		}
 		const updated = (await res.json()) as { id: string; reviewed: boolean }[];
 		for (const b of updated) {
 			const existing = blocks.find((x) => x.id === b.id);