Add basic frontend structure

frontend/static/locales/en/common.json

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+{
+  "navbar": {
+    "link": {
+      "idtoken": "Charging Cards",
+      "transaction": "Transactions",
+      "chargepoint": "Charging Stations",
+      "profile": "Profile",
+      "logout": "Logout"
+    }
+  },
+  "transactionTable": {
+    "noPreviousTransactions": "You don't have any completed transactions yet.",
+    "headerDate": "Date",
+    "headerChargepoint": "Chargepoint",
+    "headerEnergyTotal": "Energy charged",
+    "headerCost": "Cost",
+    "startTime": "Start: {{ time, datetime }}",
+    "endTime": "End: {{ time, datetime }}",
+    "detailButton": "Details"
+  }
+}

frontend/static/locales/en/dashboard.json

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+{
+  "greeting": {
+    "morning": "Good morning {{name}}!",
+    "day": "Hello {{name}}!",
+    "evening": "Good evening {{name}}!"
+  },
+  "cards": {
+    "currentTransaction": "Current Transaction",
+    "chargepoint": "Chargepoint: {{name}}",
+    "toCurrentTransactionButton": "More",
+    "noCurrentTransaction": "No active transaction",
+    "transactionCount": "Transactions",
+    "transactionEnergyTotal": "Energy Ammount",
+    "transactionCostTotal": "Cost",
+    "lastMonth": "{{val}} {{unit}} last month"
+  },
+  "table": {
+    "title": "Your recent transactions",
+    "noPreviousTransactions": "You don't have any completed transactions yet.",
+    "headerDate": "Date",
+    "headerChargepoint": "Chargepoint",
+    "headerEnergyTotal": "Energy charged",
+    "headerCost": "Cost",
+    "startTime": "Start: {{ time, datetime }}",
+    "endTime": "End: {{ time, datetime }}",
+    "detailButton": "Details"
+  }
+}

frontend/static/locales/en/login.json

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+{
+  "title": "Login",
+  "text": "Please login to your account:",
+  "passwordPlaceholder": "Password",
+  "button": "Login",
+  "toast": {
+    "reauth": "Your session expired. Please log in again.",
+    "logoutSuccess": "Successfully logged out."
+  }
+}