Add strings.

en.json

@@ -62,7 +62,22 @@
                 "disconnected": "Disconnected.",
                 "connecting": "Connecting...",
                 "reconnecting": "Reconnecting..."
-            }
+            },
+            "modals": {
+                "error": "An error occurred!",
+                "clipboard": {
+                    "unavailable": "Clipboard is unavailable!",
+                    "https": "You are not currently in a HTTPS context.",
+                    "copy": "Manual Copy:"
+                },
+                "signed_out": "You were signed out!",
+                "actions": {
+                    "ok": "Ok",
+                    "close": "Close",
+                    "reload": "Reload App"
+                }
+            },
+            "requires_online": "You need to be online to view this."
         },
         "context_menu": {
             "copy_id": "Copy ID",