Some cleanup and improvements on frontent logic

app/assets/javascripts/issue_show/components/app.vue

 <script>
 import Visibility from 'visibilityjs';
+import { s__, sprintf } from '~/locale';
 import { visitUrl } from '../../lib/utils/url_utility';
 import Poll from '../../lib/utils/poll';
 import eventHub from '../event_hub';
@@ -166,6 +167,9 @@ export default {
       const titleChanged = this.initialTitleText !== this.store.formState.title;
       return descriptionChanged || titleChanged;
     },
+    defaultErrorMessage() {
+      return sprintf(s__('Error updating  %{issuableType}.'), { issuableType: this.issuableType });
+    },
   },
   created() {
     this.service = new Service(this.endpoint);
@@ -220,9 +224,7 @@ export default {
           this.store.updateState(data);
         })
         .catch(() => {
-          const errMsg = `Error updating ${this.issuableType}`;
-
-          window.Flash(errMsg);
+          window.Flash(this.defaultErrorMessage);
         });
     },
 
@@ -260,10 +262,10 @@ export default {
           if (error && error.name === 'SpamError') {
             this.openRecaptcha();
           } else {
-            let errMsg = `Error updating ${this.issuableType}`;
+            let errMsg = this.defaultErrorMessage;
 
             if (error && error.response && error.response.data && error.response.data.errors) {
-              errMsg = error.response.data.errors;
+              errMsg += error.response.data.errors.join(' ');
             }
 
             eventHub.$emit('close.form');

app/assets/javascripts/issue_show/components/description.vue

@@ -93,7 +93,7 @@ export default {
     taskListUpdateError() {
       window.Flash(
         __(
-          'Someone edited this issue at the same time you did and we updated the issue description.',
+          'Someone edited this issue at the same time you did. The description has been updated and you will need to make your changes again.',
         ),
       );
 

locale/gitlab.pot

@@ -3040,6 +3040,9 @@ msgstr ""
 msgid "Error saving label update."
 msgstr ""
 
+msgid "Error updating  %{issuableType}"
+msgstr ""
+
 msgid "Error updating status for all todos."
 msgstr ""
 
@@ -6527,7 +6530,7 @@ msgstr ""
 msgid "Snippets"
 msgstr ""
 
-msgid "Someone edited this issue at the same time you did and we updated the issue description."
+msgid "Someone edited this issue at the same time you did. The description has been updated and you will need to make your changes again."
 msgstr ""
 
 msgid "Something went wrong on our end"

spec/javascripts/issue_show/components/description_spec.js

@@ -191,7 +191,7 @@ describe('Description component', () => {
   describe('taskListUpdateError', () => {
     it('should create flash notification and emit an event to parent', () => {
       const msg =
-        'Someone edited this issue at the same time you did and we updated the issue description.';
+        'Someone edited this issue at the same time you did. The description has been updated and you will need to make your changes again.';
       spyOn(window, 'Flash');
       spyOn(vm, '$emit');