Give proper "login incorrect" error on signin page

www/js/api.js

@@ -87,16 +87,16 @@ function callAPIRawResponse(action, data, success, failure) {
             }
             switch (textStatus) {
                 case "timeout":
-                    failure("Couldn't connect to the server (timeout).");
+                    failure("Couldn't connect to the server (timeout).", xhr);
                     break;
                 case "error":
-                    failure("Couldn't connect to the server (error).");
+                    failure("Couldn't connect to the server (error).", xhr);
                     break;
                 case "parseerror":
-                    failure("The server sent a malformed response.");
+                    failure("The server sent a malformed response.", xhr);
                     break;
                 default:
-                    failure("Couldn't connect to the server.");
+                    failure("Couldn't connect to the server.", xhr);
             }
         }
     });

www/js/signin.js

@@ -11,7 +11,7 @@ $('#username').on("keyup", function () {
 function checkAndSave(username, password) {
     app.preloader.show();
 
-    callAPI("ping", {
+    callAPIRawResponse("ping", {
         username: username,
         password: password
     }, function (data) {
@@ -32,9 +32,13 @@ function checkAndSave(username, password) {
             app.preloader.hide();
             app.dialog.alert(msg, "Error");
         });
-    }, function (msg) {
+    }, function (msg, xhr) {
         app.preloader.hide();
-        app.dialog.alert(msg, "Error");
+        if (xhr.status == 401) {
+            app.dialog.alert("Login incorrect.", "Error");
+        } else {
+            app.dialog.alert(msg, "Error");
+        }
     });
 }
 
@@ -43,4 +47,10 @@ function setupAccount() {
     var password = $("#password").val();
 
     checkAndSave(username, password);
-}
+}
+
+$("#password").on("keyup", function (evt) {
+    if (evt.keyCode == 13) {
+        setupAccount();
+    }
+})