diff --git a/frontend/src/lib/document/viewer/PdfControls.svelte b/frontend/src/lib/document/viewer/PdfControls.svelte
index f4ff798d..9d99e464 100644
--- a/frontend/src/lib/document/viewer/PdfControls.svelte
+++ b/frontend/src/lib/document/viewer/PdfControls.svelte
@@ -34,7 +34,7 @@ let {
 		<button
 			onclick={onPrev}
 			disabled={currentPage <= 1}
-			aria-label="Zurück"
+			aria-label={m.viewer_previous_page()}
 			class="min-h-[44px] min-w-[44px] rounded p-2 text-ink-3 transition hover:bg-surface/10 focus-visible:ring-2 focus-visible:ring-brand-navy focus-visible:ring-offset-1 disabled:opacity-40"
 		>
 			<svg class="h-4 w-4" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
@@ -51,7 +51,7 @@ let {
 		<button
 			onclick={onNext}
 			disabled={!isLoaded || currentPage >= totalPages}
-			aria-label="Weiter"
+			aria-label={m.viewer_next_page()}
 			class="min-h-[44px] min-w-[44px] rounded p-2 text-ink-3 transition hover:bg-surface/10 focus-visible:ring-2 focus-visible:ring-brand-navy focus-visible:ring-offset-1 disabled:opacity-40"
 		>
 			<svg class="h-4 w-4" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
@@ -64,7 +64,7 @@ let {
 	<div class="flex items-center gap-1">
 		<button
 			onclick={onZoomOut}
-			aria-label="Verkleinern"
+			aria-label={m.viewer_zoom_out()}
 			class="min-h-[44px] min-w-[44px] rounded p-2 text-ink-3 transition hover:bg-surface/10 focus-visible:ring-2 focus-visible:ring-brand-navy focus-visible:ring-offset-1"
 		>
 			<svg class="h-4 w-4" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
@@ -74,7 +74,7 @@ let {
 		</button>
 		<button
 			onclick={onZoomIn}
-			aria-label="Vergrößern"
+			aria-label={m.viewer_zoom_in()}
 			class="min-h-[44px] min-w-[44px] rounded p-2 text-ink-3 transition hover:bg-surface/10 focus-visible:ring-2 focus-visible:ring-brand-navy focus-visible:ring-offset-1"
 		>
 			<svg class="h-4 w-4" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">