diff --git a/api/assets/checkLocale.js b/api/assets/checkLocale.js
new file mode 100644
index 00000000..016d66c8
--- /dev/null
+++ b/api/assets/checkLocale.js
@@ -0,0 +1,47 @@
+			const localStorage = window.localStorage;
+			// TODO: remote auth
+			// window.GLOBAL_ENV.REMOTE_AUTH_ENDPOINT = window.GLOBAL_ENV.GATEWAY_ENDPOINT.replace(/wss?:/, "");
+			localStorage.setItem("gatewayURL", window.GLOBAL_ENV.GATEWAY_ENDPOINT);
+			localStorage.setItem(
+				"DeveloperOptionsStore",
+				`{"trace":false,"canary":false,"logGatewayEvents":true,"logOverlayEvents":true,"logAnalyticsEvents":true,"sourceMapsEnabled":false,"axeEnabled":false}`
+			);
+
+			const supportedLocales = [
+				"bg",
+				"cs",
+				"da",
+				"de",
+				"el",
+				"en-GB",
+				"es-ES",
+				"fi",
+				"fr",
+				"hi",
+				"hr",
+				"hu",
+				"it",
+				"ja",
+				"ko",
+				"lt",
+				"nl",
+				"no",
+				"pl",
+				"pt-BR",
+				"ro",
+				"ru",
+				"sv-SE",
+				"th",
+				"tr",
+				"uk",
+				"vi",
+				"zh-CN",
+				"zh-TW"
+			];
+
+			const settings = JSON.parse(localStorage.getItem("UserSettingsStore"));
+			if (settings && !supportedLocales.includes(settings.locale)) {
+				// fix client locale wrong and client not loading at all
+				settings.locale = "en-US";
+				localStorage.setItem("UserSettingsStore", JSON.stringify(settings));
+			}
\ No newline at end of file
diff --git a/api/client_test/index.html b/api/client_test/index.html
index 7e40d573..92499034 100644
--- a/api/client_test/index.html
+++ b/api/client_test/index.html
@@ -38,55 +38,9 @@
 				ALGOLIA_KEY: "aca0d7082e4e63af5ba5917d5e96bed0"
 			};
 			GLOBAL_ENV.MEDIA_PROXY_ENDPOINT = location.protocol + "//" + GLOBAL_ENV.CDN_HOST;
-			const localStorage = window.localStorage;
-			// TODO: remote auth
-			// window.GLOBAL_ENV.REMOTE_AUTH_ENDPOINT = window.GLOBAL_ENV.GATEWAY_ENDPOINT.replace(/wss?:/, "");
-			localStorage.setItem("gatewayURL", window.GLOBAL_ENV.GATEWAY_ENDPOINT);
-			localStorage.setItem(
-				"DeveloperOptionsStore",
-				`{"trace":false,"canary":false,"logGatewayEvents":true,"logOverlayEvents":true,"logAnalyticsEvents":true,"sourceMapsEnabled":false,"axeEnabled":false}`
-			);
-
-			const supportedLocales = [
-				"bg",
-				"cs",
-				"da",
-				"de",
-				"el",
-				"en-GB",
-				"es-ES",
-				"fi",
-				"fr",
-				"hi",
-				"hr",
-				"hu",
-				"it",
-				"ja",
-				"ko",
-				"lt",
-				"nl",
-				"no",
-				"pl",
-				"pt-BR",
-				"ro",
-				"ru",
-				"sv-SE",
-				"th",
-				"tr",
-				"uk",
-				"vi",
-				"zh-CN",
-				"zh-TW"
-			];
-
-			const settings = JSON.parse(localStorage.getItem("UserSettingsStore"));
-			if (settings && !supportedLocales.includes(settings.locale)) {
-				// fix client locale wrong and client not loading at all
-				settings.locale = "en-US";
-				localStorage.setItem("UserSettingsStore", JSON.stringify(settings));
-			}
 		</script>
 		<script src="/assets/autoRegister.js"></script>
+		<script src="/assets/checkLocale.js"></script>
 		<script src="/assets/479a2f1e7d625dc134b9.js"></script>
 		<script src="/assets/a15fd133a1d2d77a2424.js"></script>
 		<script src="/assets/97e6fa22aa08ee4daa5e.js"></script>