Fixes missing alt attribute

Introduced in https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/31125 but missed in the EE port.

app/assets/javascripts/ide/components/commit_sidebar/success_message.vue

@@ -10,7 +10,9 @@ export default {
 
 <template>
   <div class="multi-file-commit-panel-success-message" aria-live="assertive">
-    <div class="svg-content svg-80"><img :src="committedStateSvgPath" /></div>
+    <div class="svg-content svg-80">
+      <img :src="committedStateSvgPath" :alt="s__('IDE|Successful commit')" />
+    </div>
     <div class="append-right-default prepend-left-default">
       <div class="text-content text-center">
         <h4>{{ __('All changes are committed') }}</h4>

locale/gitlab.pot

@@ -7450,6 +7450,9 @@ msgstr ""
 msgid "IDE|Review"
 msgstr ""
 
+msgid "IDE|Successful commit"
+msgstr ""
+
 msgid "IP Address"
 msgstr ""