Feature: Add support for localization, introduce slang for translations, and integrate German and English locale support throughout the app

finlog_app/app/assets/i18n/de.i18n.json

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+{
+  "hello": "Hallo $name",
+  "login": {
+    "success": "Login erfolgreich"
+  },
+  "settings": {
+    "title": "Einstellungen",
+    "sections": {
+      "account": "Konto & Daten",
+      "app": "App",
+      "help": "Hilfe & Rechtliches"
+    },
+    "items": {
+      "appSettings": "App-Einstellungen",
+      "personalData": "Persönliche Daten",
+      "accountManagement": "Kontoverwaltung",
+      "helpCenter": "Hilfe",
+      "feedback": "Feedback",
+      "legalPrivacy": "Rechtliches & Datenschutz",
+      "logout": "Abmelden"
+    },
+    "messages": {
+      "logoutNotImplemented": "Logout… (noch nicht implementiert)"
+    }
+  }
+}

finlog_app/app/assets/i18n/en.i18n.json

@@ -0,0 +1,26 @@
+{
+  "hello": "Hello $name",
+  "login": {
+    "success": "Logged in successfully"
+  },
+  "settings": {
+    "title": "Settings",
+    "sections": {
+      "account": "Account & Data",
+      "app": "App",
+      "help": "Help & Legal"
+    },
+    "items": {
+      "appSettings": "App settings",
+      "personalData": "Personal data",
+      "accountManagement": "Account management",
+      "helpCenter": "Help",
+      "feedback": "Feedback",
+      "legalPrivacy": "Legal & Privacy",
+      "logout": "Sign out"
+    },
+    "messages": {
+      "logoutNotImplemented": "Logout… (not implemented yet)"
+    }
+  }
+}