diff --git a/src/client/components/ClassificationBadge.tsx b/src/client/components/ClassificationBadge.tsx
index 6d7c136..7eb1a71 100644
--- a/src/client/components/ClassificationBadge.tsx
+++ b/src/client/components/ClassificationBadge.tsx
@@ -1,8 +1,4 @@
-const CLASSIFICATION_LABELS: Record<string, string> = {
-	base: "Base Weight",
-	worn: "Worn",
-	consumable: "Consumable",
-};
+import { useTranslation } from "react-i18next";
 
 interface ClassificationBadgeProps {
 	classification: string;
@@ -13,7 +9,10 @@ export function ClassificationBadge({
 	classification,
 	onCycle,
 }: ClassificationBadgeProps) {
-	const label = CLASSIFICATION_LABELS[classification] ?? "Base Weight";
+	const { t } = useTranslation("collection");
+	const label = t(`classificationBadge.${classification}`, {
+		defaultValue: t("classificationBadge.base"),
+	});
 
 	return (
 		<button
diff --git a/src/client/components/ImageUpload.tsx b/src/client/components/ImageUpload.tsx
index df61fac..dc32397 100644
--- a/src/client/components/ImageUpload.tsx
+++ b/src/client/components/ImageUpload.tsx
@@ -1,4 +1,5 @@
 import { useRef, useState } from "react";
+import { useTranslation } from "react-i18next";
 import { apiUpload } from "../lib/api";
 import { GearImage, imageContainerBg } from "./GearImage";
 import { ImageCropEditor } from "./ImageCropEditor";
@@ -21,6 +22,7 @@ export function ImageUpload({
 	onChange,
 	onCropChange,
 }: ImageUploadProps) {
+	const { t } = useTranslation("common");
 	const [uploading, setUploading] = useState(false);
 	const [error, setError] = useState<string | null>(null);
 	const [localPreview, setLocalPreview] = useState<string | null>(null);
@@ -39,12 +41,12 @@ export function ImageUpload({
 		setError(null);
 
 		if (!ACCEPTED_TYPES.includes(file.type)) {
-			setError("Please select a JPG, PNG, or WebP image.");
+			setError(t("imageUpload.invalidType"));
 			return;
 		}
 
 		if (file.size > MAX_SIZE_BYTES) {
-			setError("Image must be under 5MB.");
+			setError(t("imageUpload.tooLarge"));
 			return;
 		}
 
@@ -63,7 +65,7 @@ export function ImageUpload({
 				setShowCropEditor(true);
 			}
 		} catch {
-			setError("Upload failed. Please try again.");
+			setError(t("imageUpload.uploadFailed"));
 			setLocalPreview(null);
 		} finally {
 			setUploading(false);
@@ -183,7 +185,7 @@ export function ImageUpload({
 								<path d="M12.5 5.5h3" />
 							</svg>
 							<span className="mt-2 text-sm text-gray-400 group-hover:text-gray-500 transition-colors">
-								Click to add photo
+								{t("imageUpload.clickToAdd")}
 							</span>
 						</div>
 					)}
diff --git a/src/client/components/ImpactDeltaBadge.tsx b/src/client/components/ImpactDeltaBadge.tsx
index 5fec0a7..d85614a 100644
--- a/src/client/components/ImpactDeltaBadge.tsx
+++ b/src/client/components/ImpactDeltaBadge.tsx
@@ -1,3 +1,4 @@
+import { useTranslation } from "react-i18next";
 import type { CandidateDelta } from "../hooks/useImpactDeltas";
 
 interface ImpactDeltaBadgeProps {
@@ -11,6 +12,8 @@ export function ImpactDeltaBadge({
 	type,
 	formatFn,
 }: ImpactDeltaBadgeProps) {
+	const { t } = useTranslation("setups");
+
 	if (!delta || delta.mode === "none") return null;
 
 	const value = type === "weight" ? delta.weightDelta : delta.priceDelta;
@@ -28,7 +31,7 @@ export function ImpactDeltaBadge({
 			<span className="text-xs text-green-600">
 				+{formatFn(value)}
 				{delta.mode === "add" && (
-					<span className="ml-0.5 text-green-500">(add)</span>
+					<span className="ml-0.5 text-green-500">({t("impact.adding")})</span>
 				)}
 			</span>
 		);
diff --git a/src/client/components/PlanningView.tsx b/src/client/components/PlanningView.tsx
index acf1cf4..30c277d 100644
--- a/src/client/components/PlanningView.tsx
+++ b/src/client/components/PlanningView.tsx
@@ -1,4 +1,5 @@
 import { useState } from "react";
+import { useTranslation } from "react-i18next";
 import { useCategories } from "../hooks/useCategories";
 import { useThreads } from "../hooks/useThreads";
 import { useUIStore } from "../stores/uiStore";
@@ -7,6 +8,7 @@ import { CreateThreadModal } from "./CreateThreadModal";
 import { ThreadCard } from "./ThreadCard";
 
 export function PlanningView() {
+	const { t } = useTranslation(["threads", "common"]);
 	const [activeTab, setActiveTab] = useState<"active" | "resolved">("active");
 	const [categoryFilter, setCategoryFilter] = useState<number | null>(null);
 
@@ -41,7 +43,7 @@ export function PlanningView() {
 			{/* Header row */}
 			<div className="flex items-center justify-between mb-4">
 				<h2 className="text-lg font-semibold text-gray-900">
-					Planning Threads
+					{t("threads:planning.title")}
 				</h2>
 				<button
 					type="button"
@@ -62,7 +64,7 @@ export function PlanningView() {
 							d="M12 4v16m8-8H4"
 						/>
 					</svg>
-					New Thread
+					{t("threads:create.title")}
 				</button>
 			</div>
 
@@ -79,7 +81,7 @@ export function PlanningView() {
 								: "text-gray-600 hover:bg-gray-200"
 						}`}
 					>
-						Active
+						{t("threads:status.active")}
 					</button>
 					<button
 						type="button"
@@ -90,7 +92,7 @@ export function PlanningView() {
 								: "text-gray-600 hover:bg-gray-200"
 						}`}
 					>
-						Resolved
+						{t("threads:status.resolved")}
 					</button>
 				</div>
 
@@ -107,7 +109,7 @@ export function PlanningView() {
 				<div className="py-16">
 					<div className="max-w-lg mx-auto text-center">
 						<h2 className="text-xl font-semibold text-gray-900 mb-8">
-							Plan your next purchase
+							{t("threads:planning.emptyTitle")}
 						</h2>
 						<div className="space-y-6 text-left mb-10">
 							<div className="flex items-start gap-4">
@@ -115,9 +117,9 @@ export function PlanningView() {
 									1
 								</div>
 								<div>
-									<p className="font-medium text-gray-900">Create a thread</p>
+									<p className="font-medium text-gray-900">{t("threads:planning.step1Title")}</p>
 									<p className="text-sm text-gray-500">
-										Start a research thread for gear you're considering
+										{t("threads:planning.step1Description")}
 									</p>
 								</div>
 							</div>
@@ -126,9 +128,9 @@ export function PlanningView() {
 									2
 								</div>
 								<div>
-									<p className="font-medium text-gray-900">Add candidates</p>
+									<p className="font-medium text-gray-900">{t("threads:planning.step2Title")}</p>
 									<p className="text-sm text-gray-500">
-										Add products you're comparing with prices and weights
+										{t("threads:planning.step2Description")}
 									</p>
 								</div>
 							</div>
@@ -137,9 +139,9 @@ export function PlanningView() {
 									3
 								</div>
 								<div>
-									<p className="font-medium text-gray-900">Pick a winner</p>
+									<p className="font-medium text-gray-900">{t("threads:planning.step3Title")}</p>
 									<p className="text-sm text-gray-500">
-										Resolve the thread and the winner joins your collection
+										{t("threads:planning.step3Description")}
 									</p>
 								</div>
 							</div>
@@ -163,13 +165,13 @@ export function PlanningView() {
 									d="M12 4v16m8-8H4"
 								/>
 							</svg>
-							Create your first thread
+							{t("threads:planning.createFirst")}
 						</button>
 					</div>
 				</div>
 			) : filteredThreads.length === 0 ? (
 				<div className="py-12 text-center">
-					<p className="text-sm text-gray-500">No threads found</p>
+					<p className="text-sm text-gray-500">{t("threads:empty.noThreads")}</p>
 				</div>
 			) : (
 				<div className="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-3 gap-4">
diff --git a/src/client/components/PublicSetupCard.tsx b/src/client/components/PublicSetupCard.tsx
index 64d3090..2e09af8 100644
--- a/src/client/components/PublicSetupCard.tsx
+++ b/src/client/components/PublicSetupCard.tsx
@@ -1,4 +1,5 @@
 import { Link } from "@tanstack/react-router";
+import { useTranslation } from "react-i18next";
 
 interface PublicSetupCardProps {
 	setup: {
@@ -11,6 +12,7 @@ interface PublicSetupCardProps {
 }
 
 export function PublicSetupCard({ setup }: PublicSetupCardProps) {
+	const { t } = useTranslation("setups");
 	const formattedDate = new Date(setup.createdAt).toLocaleDateString(
 		undefined,
 		{
@@ -30,13 +32,13 @@ export function PublicSetupCard({ setup }: PublicSetupCardProps) {
 				{setup.name}
 			</h3>
 			<p className="text-xs text-gray-400 mt-0.5">
-				by {setup.creatorName || "Anonymous"}
+				{t("card.by", { name: setup.creatorName || t("card.anonymous") })}
 			</p>
 			<div className="flex items-center justify-between mt-2">
 				<div className="flex items-center gap-2">
 					{setup.itemCount != null && setup.itemCount > 0 && (
 						<span className="inline-flex items-center px-2 py-0.5 rounded-full text-xs font-medium bg-blue-50 text-blue-400">
-							{setup.itemCount} {setup.itemCount === 1 ? "item" : "items"}
+							{t("card.items", { count: setup.itemCount })}
 						</span>
 					)}
 				</div>
diff --git a/src/client/components/SetupImpactSelector.tsx b/src/client/components/SetupImpactSelector.tsx
index b282ea2..536cfcf 100644
--- a/src/client/components/SetupImpactSelector.tsx
+++ b/src/client/components/SetupImpactSelector.tsx
@@ -1,3 +1,4 @@
+import { useTranslation } from "react-i18next";
 import { useSetups } from "../hooks/useSetups";
 import { useUIStore } from "../stores/uiStore";
 
@@ -8,6 +9,7 @@ interface SetupImpactSelectorProps {
 export function SetupImpactSelector({
 	threadStatus,
 }: SetupImpactSelectorProps) {
+	const { t } = useTranslation("setups");
 	const { data: setups } = useSetups();
 	const selectedSetupId = useUIStore((s) => s.selectedSetupId);
 	const setSelectedSetupId = useUIStore((s) => s.setSelectedSetupId);
@@ -23,7 +25,7 @@ export function SetupImpactSelector({
 			}
 			className="border border-gray-200 rounded-lg text-sm px-3 py-1.5 text-gray-700 bg-white focus:outline-none focus:ring-2 focus:ring-gray-300"
 		>
-			<option value="">Compare with setup...</option>
+			<option value="">{t("impact.compareWith")}</option>
 			{setups.map((setup) => (
 				<option key={setup.id} value={setup.id}>
 					{setup.name}
diff --git a/src/client/components/ThreadCard.tsx b/src/client/components/ThreadCard.tsx
index 3b956f7..8d160f4 100644
--- a/src/client/components/ThreadCard.tsx
+++ b/src/client/components/ThreadCard.tsx
@@ -1,4 +1,5 @@
 import { useNavigate } from "@tanstack/react-router";
+import { useTranslation } from "react-i18next";
 import { useFormatters } from "../hooks/useFormatters";
 import { LucideIcon } from "../lib/iconData";
 
@@ -31,6 +32,7 @@ export function ThreadCard({
 	categoryIcon,
 }: ThreadCardProps) {
 	const navigate = useNavigate();
+	const { t } = useTranslation("threads");
 	const { price } = useFormatters();
 
 	function formatPriceRange(
@@ -62,7 +64,7 @@ export function ThreadCard({
 				<h3 className="text-sm font-semibold text-gray-900 truncate">{name}</h3>
 				{isResolved && (
 					<span className="ml-2 inline-flex items-center px-2 py-0.5 rounded-full text-xs font-medium bg-gray-100 text-gray-500 shrink-0">
-						Resolved
+						{t("status.resolved")}
 					</span>
 				)}
 			</div>
@@ -76,7 +78,7 @@ export function ThreadCard({
 					{categoryName}
 				</span>
 				<span className="inline-flex items-center px-2 py-0.5 rounded-full text-xs font-medium bg-purple-50 text-purple-500">
-					{candidateCount} {candidateCount === 1 ? "candidate" : "candidates"}
+					{t("card.candidates", { count: candidateCount })}
 				</span>
 				<span className="inline-flex items-center px-2 py-0.5 rounded-full text-xs font-medium bg-gray-50 text-gray-600">
 					{formatDate(createdAt)}
diff --git a/src/client/components/ThreadTabs.tsx b/src/client/components/ThreadTabs.tsx
index a365f3a..2aa93e4 100644
--- a/src/client/components/ThreadTabs.tsx
+++ b/src/client/components/ThreadTabs.tsx
@@ -1,3 +1,5 @@
+import { useTranslation } from "react-i18next";
+
 type TabKey = "gear" | "planning" | "setups";
 
 interface CollectionTabsProps {
@@ -5,13 +7,14 @@ interface CollectionTabsProps {
 	onChange: (tab: TabKey) => void;
 }
 
-const tabs = [
-	{ key: "gear" as const, label: "My Gear" },
-	{ key: "planning" as const, label: "Planning" },
-	{ key: "setups" as const, label: "Setups" },
-];
-
 export function CollectionTabs({ active, onChange }: CollectionTabsProps) {
+	const { t } = useTranslation("collection");
+	const tabs = [
+		{ key: "gear" as const, label: t("gear") },
+		{ key: "planning" as const, label: t("planning") },
+		{ key: "setups" as const, label: t("tabs.setups") },
+	];
+
 	return (
 		<div className="flex border-b border-gray-200">
 			{tabs.map((tab) => (
diff --git a/src/client/components/TotalsBar.tsx b/src/client/components/TotalsBar.tsx
index 1c066b5..819757b 100644
--- a/src/client/components/TotalsBar.tsx
+++ b/src/client/components/TotalsBar.tsx
@@ -1,4 +1,5 @@
 import { Link } from "@tanstack/react-router";
+import { useTranslation } from "react-i18next";
 import { useAuth } from "../hooks/useAuth";
 import { LucideIcon } from "../lib/iconData";
 import { UserMenu } from "./UserMenu";
@@ -9,6 +10,7 @@ interface TotalsBarProps {
 }
 
 export function TotalsBar({ title = "GearBox", linkTo }: TotalsBarProps) {
+	const { t } = useTranslation("common");
 	const { data: auth } = useAuth();
 	const isAuthenticated = !!auth?.user;
 
@@ -43,7 +45,7 @@ export function TotalsBar({ title = "GearBox", linkTo }: TotalsBarProps) {
 								to="/login"
 								className="text-xs text-gray-500 hover:text-gray-700 transition-colors"
 							>
-								Sign in
+								{t("auth.signIn")}
 							</Link>
 						)}
 					</div>
diff --git a/src/client/locales/de/collection.json b/src/client/locales/de/collection.json
index 03240c3..b1648ec 100644
--- a/src/client/locales/de/collection.json
+++ b/src/client/locales/de/collection.json
@@ -27,5 +27,17 @@
 		"light": "Leicht",
 		"medium": "Mittel",
 		"heavy": "Schwer"
+	},
+	"tabs": {
+		"setups": "Setups"
+	},
+	"totals": {
+		"totalWeight": "Gesamtgewicht",
+		"totalCost": "Gesamtkosten"
+	},
+	"classificationBadge": {
+		"base": "Basisgewicht",
+		"worn": "Getragen",
+		"consumable": "Verbrauchsmaterial"
 	}
 }
diff --git a/src/client/locales/de/common.json b/src/client/locales/de/common.json
index 4ba9618..4934d11 100644
--- a/src/client/locales/de/common.json
+++ b/src/client/locales/de/common.json
@@ -82,6 +82,12 @@
 		"recentlyAdded": "Kürzlich hinzugefügt",
 		"trendingCategories": "Trend-Kategorien"
 	},
+	"imageUpload": {
+		"clickToAdd": "Zum Hinzufügen klicken",
+		"invalidType": "Bitte wählen Sie ein JPG-, PNG- oder WebP-Bild aus.",
+		"tooLarge": "Das Bild muss kleiner als 5 MB sein.",
+		"uploadFailed": "Upload fehlgeschlagen. Bitte versuchen Sie es erneut."
+	},
 	"profile": {
 		"title": "Profil",
 		"account": "Konto",
diff --git a/src/client/locales/de/setups.json b/src/client/locales/de/setups.json
index 3eb2f45..79c0e10 100644
--- a/src/client/locales/de/setups.json
+++ b/src/client/locales/de/setups.json
@@ -6,10 +6,12 @@
 		"description": "Erstellen Sie ein Setup, um Ausruestung fuer bestimmte Reisen oder Aktivitaeten zu organisieren."
 	},
 	"card": {
-		"items": "{{count}} Gegenstaende",
+		"items": "{{count}} Gegenstände",
 		"items_one": "{{count}} Gegenstand",
 		"weight": "Gewicht",
-		"price": "Preis"
+		"price": "Preis",
+		"by": "von {{name}}",
+		"anonymous": "Anonym"
 	},
 	"share": {
 		"title": "Setup teilen",
@@ -37,7 +39,8 @@
 	},
 	"impact": {
 		"title": "Auswirkungsvorschau",
-		"adding": "Hinzufuegen",
-		"removing": "Entfernen"
+		"adding": "Hinzufügen",
+		"removing": "Entfernen",
+		"compareWith": "Mit Setup vergleichen..."
 	}
 }
diff --git a/src/client/locales/de/threads.json b/src/client/locales/de/threads.json
index f36d656..7601ef7 100644
--- a/src/client/locales/de/threads.json
+++ b/src/client/locales/de/threads.json
@@ -39,7 +39,22 @@
 		"message": "<bold>{{name}}</bold> als Gewinner waehlen? Der Gegenstand wird Ihrer Sammlung hinzugefuegt und der Thread archiviert."
 	},
 	"empty": {
-		"noThreads": "Noch keine Recherche-Threads",
+		"noThreads": "Keine Threads gefunden",
 		"noCandidates": "Noch keine Kandidaten"
+	},
+	"card": {
+		"candidates": "{{count}} Kandidaten",
+		"candidates_one": "{{count}} Kandidat"
+	},
+	"planning": {
+		"title": "Planungs-Threads",
+		"emptyTitle": "Nächsten Kauf planen",
+		"createFirst": "Ersten Thread erstellen",
+		"step1Title": "Thread erstellen",
+		"step1Description": "Starten Sie einen Recherche-Thread für Ausrüstung, die Sie in Betracht ziehen",
+		"step2Title": "Kandidaten hinzufügen",
+		"step2Description": "Fügen Sie Produkte hinzu, die Sie mit Preisen und Gewichten vergleichen",
+		"step3Title": "Gewinner wählen",
+		"step3Description": "Thread abschließen und der Gewinner kommt in Ihre Sammlung"
 	}
 }
diff --git a/src/client/locales/en/collection.json b/src/client/locales/en/collection.json
index 0dfb0e4..452a41f 100644
--- a/src/client/locales/en/collection.json
+++ b/src/client/locales/en/collection.json
@@ -27,5 +27,17 @@
 		"light": "Light",
 		"medium": "Medium",
 		"heavy": "Heavy"
+	},
+	"tabs": {
+		"setups": "Setups"
+	},
+	"totals": {
+		"totalWeight": "Total Weight",
+		"totalCost": "Total Cost"
+	},
+	"classificationBadge": {
+		"base": "Base Weight",
+		"worn": "Worn",
+		"consumable": "Consumable"
 	}
 }
diff --git a/src/client/locales/en/common.json b/src/client/locales/en/common.json
index f91738d..d134eef 100644
--- a/src/client/locales/en/common.json
+++ b/src/client/locales/en/common.json
@@ -82,6 +82,12 @@
 		"recentlyAdded": "Recently Added",
 		"trendingCategories": "Trending Categories"
 	},
+	"imageUpload": {
+		"clickToAdd": "Click to add photo",
+		"invalidType": "Please select a JPG, PNG, or WebP image.",
+		"tooLarge": "Image must be under 5MB.",
+		"uploadFailed": "Upload failed. Please try again."
+	},
 	"profile": {
 		"title": "Profile",
 		"account": "Account",
diff --git a/src/client/locales/en/setups.json b/src/client/locales/en/setups.json
index 4b44a0a..5c30138 100644
--- a/src/client/locales/en/setups.json
+++ b/src/client/locales/en/setups.json
@@ -9,7 +9,9 @@
 		"items": "{{count}} items",
 		"items_one": "{{count}} item",
 		"weight": "Weight",
-		"price": "Price"
+		"price": "Price",
+		"by": "by {{name}}",
+		"anonymous": "Anonymous"
 	},
 	"share": {
 		"title": "Share Setup",
@@ -38,6 +40,7 @@
 	"impact": {
 		"title": "Impact Preview",
 		"adding": "Adding",
-		"removing": "Removing"
+		"removing": "Removing",
+		"compareWith": "Compare with setup..."
 	}
 }
diff --git a/src/client/locales/en/threads.json b/src/client/locales/en/threads.json
index dcb68b6..10d780e 100644
--- a/src/client/locales/en/threads.json
+++ b/src/client/locales/en/threads.json
@@ -39,7 +39,22 @@
 		"message": "Pick <bold>{{name}}</bold> as the winner? This will add it to your collection and archive the thread."
 	},
 	"empty": {
-		"noThreads": "No research threads yet",
+		"noThreads": "No threads found",
 		"noCandidates": "No candidates yet"
+	},
+	"card": {
+		"candidates": "{{count}} candidates",
+		"candidates_one": "{{count}} candidate"
+	},
+	"planning": {
+		"title": "Planning Threads",
+		"emptyTitle": "Plan your next purchase",
+		"createFirst": "Create your first thread",
+		"step1Title": "Create a thread",
+		"step1Description": "Start a research thread for gear you're considering",
+		"step2Title": "Add candidates",
+		"step2Description": "Add products you're comparing with prices and weights",
+		"step3Title": "Pick a winner",
+		"step3Description": "Resolve the thread and the winner joins your collection"
 	}
 }