diff --git a/languages/de.json b/languages/de.json
index c1b01d6..c8a9eac 100644
--- a/languages/de.json
+++ b/languages/de.json
@@ -28,7 +28,7 @@
 		"languages": {
 			"en": "Englisch",
 			"de": "Deutsch",
-			"kor": "Koreanisch"
+			"ko": "Koreanisch"
 		},
 		"logout": "Abmelden",
 		"search": "Durchsuche deine Reisen..."
diff --git a/languages/en.json b/languages/en.json
index 0564199..59c4ffd 100644
--- a/languages/en.json
+++ b/languages/en.json
@@ -27,7 +27,7 @@
 	"header": {
 		"languages": {
 			"en": "English",
-			"kor": "Korean",
+			"ko": "Korean",
 			"de": "German"
 		},
 		"logout": "Logout",
diff --git a/languages/kor.json b/languages/ko.json
similarity index 99%
rename from languages/kor.json
rename to languages/ko.json
index 1300840..ae592a1 100644
--- a/languages/kor.json
+++ b/languages/ko.json
@@ -28,7 +28,7 @@
 		"languages": {
 			"en": "엉어",
 			"de": "독일어",
-			"kor": "한국어"
+			"ko": "한국어"
 		},
 		"logout": "로그아웃",
 		"search": "여행 겁색..."
diff --git a/src/components/general/_LanguageSelector.svelte b/src/components/general/_LanguageSelector.svelte
index 6198bdc..5c7680c 100644
--- a/src/components/general/_LanguageSelector.svelte
+++ b/src/components/general/_LanguageSelector.svelte
@@ -1,11 +1,11 @@
 <script lang="ts">
 	import { i, language, loadResource, switchLanguage } from '@inlang/sdk-js';
 	import { ListBox, ListBoxItem, popup, type PopupSettings } from '@skeletonlabs/skeleton';
-	import { De, Us, Kr } from 'svelte-flag-icons';
+	import { De, Kr, Us } from 'svelte-flag-icons';
 
 	let languages = [
 		{ id: 'en', title: i('header.languages.en'), icon: Us },
-		{ id: 'kor', title: i('header.languages.kor'), icon: Kr },
+		{ id: 'ko', title: i('header.languages.ko'), icon: Kr },
 		{ id: 'de', title: i('header.languages.de'), icon: De }
 	];
 
@@ -29,6 +29,7 @@
 
 	const switchLanguageHandler = async (e: MouseEvent) => {
 		const value = (e.target as HTMLButtonElement).value;
+		console.log(`Switching language to: ${value}`);
 		await switchLanguage(value);
 
 		// Switch language titles for the current language
diff --git a/src/components/history/_HistoryItem.svelte b/src/components/history/_HistoryItem.svelte
index 9601b5d..53f7f62 100644
--- a/src/components/history/_HistoryItem.svelte
+++ b/src/components/history/_HistoryItem.svelte
@@ -3,10 +3,9 @@
 	import { ParticipantIconDebt } from '$components';
 	import type { Transaction } from '$tripDomain';
 	import { calculateDate } from '$utils';
-	import { language } from '@inlang/sdk-js';
+	import { i, language } from '@inlang/sdk-js';
 	import { ArrowLongRight } from '@steeze-ui/heroicons';
 	import { Icon } from '@steeze-ui/svelte-icon';
-	import { i } from '@inlang/sdk-js';
 
 	export let transaction: Transaction;
 
@@ -18,9 +17,11 @@
 		[key: string]: string;
 		en: string;
 		de: string;
+		ko: string;
 	} = {
 		en: 'en-US',
-		de: 'de-de'
+		de: 'de-de',
+		ko: 'ko-KR'
 	};
 
 	$: dateFormat = dateFormats[language];
diff --git a/src/components/tripDetails/Modal/_ShowCostItemTripDetailsModal.svelte b/src/components/tripDetails/Modal/_ShowCostItemTripDetailsModal.svelte
index 15f9a40..faa18c0 100644
--- a/src/components/tripDetails/Modal/_ShowCostItemTripDetailsModal.svelte
+++ b/src/components/tripDetails/Modal/_ShowCostItemTripDetailsModal.svelte
@@ -1,7 +1,7 @@
 <script lang="ts">
 	import type { CostDateAsString } from '$tripDomain';
 	import { calculateDate, pickTextColorBasedOnBgColorSimple } from '$utils';
-	import { language, i } from '@inlang/sdk-js';
+	import { i, language } from '@inlang/sdk-js';
 
 	export let cost: CostDateAsString;
 
@@ -9,9 +9,11 @@
 		[key: string]: string;
 		en: string;
 		de: string;
+		ko: string;
 	} = {
 		en: 'en-US',
-		de: 'de-de'
+		de: 'de-de',
+		ko: 'ko-KR'
 	};
 
 	// get the date format based on the current language
diff --git a/src/components/tripDetails/_CostItemTripDetails.svelte b/src/components/tripDetails/_CostItemTripDetails.svelte
index 701d68a..08f6fa6 100644
--- a/src/components/tripDetails/_CostItemTripDetails.svelte
+++ b/src/components/tripDetails/_CostItemTripDetails.svelte
@@ -24,9 +24,11 @@
 		[key: string]: string;
 		en: string;
 		de: string;
+		ko: string;
 	} = {
 		en: 'en-US',
-		de: 'de-de'
+		de: 'de-de',
+		ko: 'ko-KR'
 	};
 
 	// get the date format based on the current language
diff --git a/src/components/tripDetails/_ParticipantIcon.svelte b/src/components/tripDetails/_ParticipantIcon.svelte
index a94d5ec..43fe24c 100644
--- a/src/components/tripDetails/_ParticipantIcon.svelte
+++ b/src/components/tripDetails/_ParticipantIcon.svelte
@@ -10,9 +10,11 @@
 		[key: string]: string;
 		en: string;
 		de: string;
+		ko: string;
 	} = {
 		en: 'en-US',
-		de: 'de-de'
+		de: 'de-de',
+		ko: 'ko-KR'
 	};
 
 	// get the date format based on the current language
diff --git a/src/components/tripOverview/_TripInfos.svelte b/src/components/tripOverview/_TripInfos.svelte
index 187f0ee..45dcce0 100644
--- a/src/components/tripOverview/_TripInfos.svelte
+++ b/src/components/tripOverview/_TripInfos.svelte
@@ -9,9 +9,11 @@
 		[key: string]: string;
 		en: string;
 		de: string;
+		ko: string;
 	} = {
 		en: 'en-US',
-		de: 'de-de'
+		de: 'de-de',
+		ko: 'ko-KR'
 	};
 
 	// get the date format based on the current language
diff --git a/src/hooks.server.ts b/src/hooks.server.ts
index 13a8399..0c1cb45 100644
--- a/src/hooks.server.ts
+++ b/src/hooks.server.ts
@@ -18,7 +18,8 @@ const unauthorizedRoutes = [
 	'/api/users/verify-reset-token', // Verify reset token API
 	'/api/users/reset-password', // Reset password API
 	'/inlang/en.json', // Inlang API for English
-	'/inlang/de.json' // Inlang API for German
+	'/inlang/de.json', // Inlang API for German
+	'/inlang/ko.json' // Inlang API for Korean
 ];
 
 export const handle: Handle = async ({ event, resolve }) => {
@@ -94,7 +95,7 @@ export const handleFetch: HandleFetch = ({ event, request, fetch }) => {
 	console.log(`Outgoing request to ${url}`);
 
 	if (PUBLIC_BASE_URL === url.origin) {
-		request.headers.set('Authorization', event.request.headers.get('Authorization') || '');
+		request.headers.set('Authorization', event.request.headers.get('Authorization') ?? '');
 	}
 
 	return fetch(request);
diff --git a/src/routes/(app)/profile/+page.svelte b/src/routes/(app)/profile/+page.svelte
index 55541d6..5d1e099 100644
--- a/src/routes/(app)/profile/+page.svelte
+++ b/src/routes/(app)/profile/+page.svelte
@@ -16,9 +16,11 @@
 		[key: string]: string;
 		en: string;
 		de: string;
+		ko: string;
 	} = {
 		en: 'en-US',
-		de: 'de-de'
+		de: 'de-de',
+		ko: 'ko-KR'
 	};
 
 	// get the date format based on the current language