Add basic frontend structure

frontend/static/locales/en/common.json

@@ -0,0 +1,21 @@
+{
+  "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"
+  }
+}