refactor: streamline language initialization and update Container component in HomePage and MyLoansPage

FrontendV2/src/App.tsx

@@ -11,6 +11,7 @@ import { UserContext, type User } from "./states/Context";
 import { triggerLogoutAtom } from "@/states/Atoms";
 import { MyLoansPage } from "./pages/MyLoansPage";
 import Landingpage from "./pages/Landingpage";
+import { changeLanguage } from "i18next";
 
 const API_BASE =
   (import.meta as any).env?.VITE_BACKEND_URL ||
@@ -44,6 +45,21 @@ function App() {
       };
       verifyToken();
     }
+
+    // set initial language
+    if (!Cookies.get("language")) {
+      const getBrowserLanguage = () => {
+        const lang = navigator.languages?.[0] || navigator.language || "en";
+        return lang.split("-")[0].toLowerCase();
+      };
+
+      changeLanguage(getBrowserLanguage());
+      Cookies.set("language", getBrowserLanguage());
+    }
+
+    if (Cookies.get("language")) {
+      changeLanguage(Cookies.get("language") || "en");
+    }
   }, []);
 
   return (

FrontendV2/src/pages/HomePage.tsx

@@ -46,7 +46,7 @@ export const HomePage = () => {
   };
 
   return (
-    <Container maxW="7xl" className="px-6 sm:px-8 pt-10">
+    <Container className="px-6 sm:px-8 pt-10">
       <Header />
       {isMsg && (
         <MyAlert
@@ -92,9 +92,7 @@ export const HomePage = () => {
               if (response && response.status === "error") {
                 setMsgStatus("error");
                 setMsgTitle(response.title || t("error"));
-                setMsgDescription(
-                  response.description || t("unknown-error")
-                );
+                setMsgDescription(response.description || t("unknown-error"));
                 setIsMsg(true);
                 return;
               }
@@ -147,9 +145,7 @@ export const HomePage = () => {
                 if (response.status === "error") {
                   setMsgStatus("error");
                   setMsgTitle(response.title || t("error"));
-                  setMsgDescription(
-                    response.description || t("unknown-error")
-                  );
+                  setMsgDescription(response.description || t("unknown-error"));
                   setIsMsg(true);
                   return;
                 }

FrontendV2/src/pages/MyLoansPage.tsx

@@ -117,7 +117,7 @@ export const MyLoansPage = () => {
 
   return (
     <>
-      <Container maxW="7xl" className="px-6 sm:px-8 pt-10">
+      <Container className="px-6 sm:px-8 pt-10">
         <Header />
         {isMsg && (
           <MyAlert

FrontendV2/src/utils/i18n/index.ts

@@ -1,5 +1,6 @@
 import i18n from "i18next";
 import { initReactI18next } from "react-i18next";
+import Cookies from "js-cookie";
 
 import enLang from "./locales/en/en.json";
 import deLang from "./locales/de/de.json";
@@ -21,7 +22,7 @@ i18n
   .init({
     resources,
     fallbackLng: "en", // use en if detected lng is not available
-    lng: "de", // language to use, more information here: https://www.i18next.com/overview/configuration-options#languages-namespaces-resources
+    lng: Cookies.get("language") || "en", // language to use, more information here: https://www.i18next.com/overview/configuration-options#languages-namespaces-resources
     // you can use the i18n.changeLanguage function to change the language manually: https://www.i18next.com/overview/api#changelanguage
     // if you're using a language detector, do not define the lng option
 

FrontendV2/src/utils/i18n/locales/en/en.json

@@ -1,3 +1,62 @@
 {
-    "greeting": "Welcome back, "
+    "greeting": "Welcome back, ",
+    "err_pw_change": "Password change failed",
+    "pw_mismatch": "Please check your input",
+    "pw_success": "Password changed successfully",
+    "pw_success_desc": "Your password was changed successfully.",
+    "create-loan": "Create loan",
+    "my-loans": "My loans",
+    "change-password": "Change password",
+    "help": "Help",
+    "source-code": "Source code",
+    "logout": "Log out",
+    "old-password": "Old password",
+    "new-password": "New password",
+    "confirm-password": "Repeat new password",
+    "cancel": "Cancel",
+    "save": "Save",
+    "start-date": "Start date",
+    "end-date": "End date",
+    "missing-fields": "Missing fields",
+    "missing-fields-desc": "Please provide start and end date.",
+    "error": "Error",
+    "unknown-error": "Unknown frontend error",
+    "get-borrowable-items": "Fetch available items",
+    "loading": "Loading...",
+    "item": "Item",
+    "success": "Success",
+    "loan-success": "Loan created successfully",
+    "error-by-loading": "Error while loading",
+    "unexpected-date-format_loan": "Unexpected date format received. (Loans)",
+    "unexpected-date-format_device": "Unexpected date format received. (Device)",
+    "error-fetching-loans": "The loans could not be retrieved.",
+    "all-loans": "All loans",
+    "username": "Username",
+    "rented-items": "Borrowed items",
+    "return-date": "Return date",
+    "take-date": "Collection date",
+    "no-loans-found": "No loans found.",
+    "all-devices": "All devices",
+    "rent-role": "Loan role",
+    "legend": "Legend",
+    "in-locker": "In locker",
+    "not-in-locker": "Not in locker",
+    "login-failed": "Login failed",
+    "login": "Log in",
+    "enter-credentials": "Please enter your credentials below.",
+    "password": "Password",
+    "logout-success": "Successfully logged out",
+    "logout-success-desc": "You have been logged out successfully.",
+    "network-error-fetching-loans": "Network error while loading loans.",
+    "error-deleting-loan": "The loan could not be deleted.",
+    "loan-deletion-success": "The loan was deleted successfully.",
+    "network-error-deleting-loan": "Network error while deleting the loan.",
+    "loan-code": "Loan code",
+    "devices": "Devices",
+    "actions": "Actions",
+    "sure": "Are you sure?",
+    "sure-delete-loan-0": "Do you really want to delete the loan with the ",
+    "sure-delete-loan-1": " loan code?",
+    "sure-delete-loan-2": "It will remain visible to the admin.",
+    "delete": "Delete"
 }