replaced string `discussion` with `thread`

ee/app/assets/javascripts/batch_comments/components/preview_item.vue

@@ -39,7 +39,7 @@ export default {
         return file.file_path;
       }
 
-      return sprintf(__("%{authorsName}'s discussion"), {
+      return sprintf(__("%{authorsName}'s thread"), {
         authorsName: this.discussion.notes.find(note => !note.system).author.name,
       });
     },

ee/app/assets/javascripts/batch_comments/mixins/resolved_status.js

@@ -36,14 +36,14 @@ export default {
 
       if (discussionToBeResolved) {
         if (discussionResolved) {
-          message = s__('MergeRequests|Discussion stays resolved');
+          message = s__('MergeRequests|Thread stays resolved');
         } else {
-          message = s__('MergeRequests|Discussion will be resolved');
+          message = s__('MergeRequests|Thread will be resolved');
         }
       } else if (discussionResolved) {
-        message = s__('MergeRequests|Discussion will be unresolved');
+        message = s__('MergeRequests|Thread will be unresolved');
       } else if (this.$options.showStaysResolved) {
-        message = s__('MergeRequests|Discussion stays unresolved');
+        message = s__('MergeRequests|Thread stays unresolved');
       }
 
       return message;

ee/app/assets/javascripts/batch_comments/stores/modules/batch_comments/actions.js

@@ -21,7 +21,7 @@ export const addDraftToDiscussion = ({ commit }, { endpoint, data }) =>
       return res;
     })
     .catch(() => {
-      flash(__('An error occurred adding a draft to the discussion.'));
+      flash(__('An error occurred adding a draft to the thread.'));
     });
 
 export const createNewDraft = ({ commit }, { endpoint, data }) =>