Added regex to look for the field that is duplicated. Not sure if there is a better way to do it.

client/coral-framework/translations.json

@@ -14,7 +14,8 @@
       "PASSWORD_REQUIRED": "Must input a password",
       "PASSWORD_LENGTH": "Password is too short",
       "EMAIL_IN_USE": "Email address already in use",
-      "EMAIL_DISPLAYNAME_IN_USE": "Email address or display name already in use",
+      "EMAIL_DISPLAY_NAME_IN_USE": "Email address or display name already in use",
+      "DISPLAYNAME_IN_USE": "Display name already in use",
       "DISPLAY_NAME_REQUIRED": "Must input a display name",
       "NO_SPECIAL_CHARACTERS": "Display names can contain letters, numbers and _ only",
       "PROFANITY_ERROR": "Display names must not contain profanity. Please contact the administrator if you believe this to be in error."
@@ -31,12 +32,12 @@
       "displayName": "Los nombres pueden contener letras, números y _",
       "confirmPassword": "Las contraseñas no coinciden",
       "emailPasswordError": "Email y/o contraseña incorrecta.",
-      "emailInUse": "Correo electronico en uso.",
-      "emailORusernameInUse": "Correo o Nombre en uso.",
       "EMAIL_REQUIRED": "Se requiere una dirección de correo electrónico",
       "PASSWORD_REQUIRED": "Debe ingresar una contraseña",
       "PASSWORD_LENGTH": "La contraseña es muy corta",
       "EMAIL_IN_USE": "La dirección de correo electrónico se encuentra en uso",
+      "EMAIL_DISPLAY_NAME_IN_USE": "Correo o Nombre en uso.",
+      "DISPLAYNAME_IN_USE": "Nombre en uso.",
       "DISPLAY_NAME_REQUIRED": "Debe ingresar un nombre",
       "NO_SPECIAL_CHARACTERS": "Los nombres pueden contener letras, números y _",
       "PROFANITY_ERROR": "Los nombres no pueden contener blasfemias. Por favor contacte al administrador si cree que esto es un error"

errors.js

@@ -15,9 +15,9 @@ const ErrEmailTaken = new Error('Email address already in use');
 ErrEmailTaken.translation_key = 'EMAIL_IN_USE';
 ErrEmailTaken.status = 400;
 
-const ErrEmailDisplaynameTaken = new Error('Email or Display name already in use');
-ErrEmailDisplaynameTaken.translation_key = 'EMAIL_DISPLAYNAME_IN_USE';
-ErrEmailDisplaynameTaken.status = 400;
+const ErrDisplayTaken = new Error('Display name already in use');
+ErrDisplayTaken.translation_key = 'DISPLAYNAME_IN_USE';
+ErrDisplayTaken.status = 400;
 
 const ErrSpecialChars = new Error('No special characters are allowed in a display name');
 ErrSpecialChars.translation_key = 'NO_SPECIAL_CHARACTERS';
@@ -45,5 +45,6 @@ module.exports = {
   ErrEmailTaken,
   ErrSpecialChars,
   ErrMissingDisplay,
-  ErrContainsProfanity
+  ErrContainsProfanity,
+  ErrDisplayTaken
 };

models/user.js

@@ -383,7 +383,11 @@ UserService.createLocalUser = (email, password, displayName) => {
           user.save((err) => {
             if (err) {
               if (err.code === 11000) {
-                return reject(errors.ErrEmailDisplaynameTaken);
+                const regex = new RegExp('displayName', 'g');
+                if (regex.exec(err.message)[0] === 'displayName') {
+                  return reject(errors.ErrDisplayTaken);
+                }
+                return reject(errors.ErrEmailTaken);
               }
               return reject(err);
             }