Fix some duplicate message IDs in Bulk Importer. (#6850)

app/import.go

@@ -1081,14 +1081,14 @@ func ImportDirectPost(data *DirectPostImportData, dryRun bool) *model.AppError {
 	if len(userIds) == 2 {
 		ch, err := createDirectChannel(userIds[0], userIds[1])
 		if err != nil && err.Id != store.CHANNEL_EXISTS_ERROR {
-			return model.NewAppError("BulkImport", "app.import.import_direct_channel.create_direct_channel.error", nil, "", http.StatusBadRequest)
+			return model.NewAppError("BulkImport", "app.import.import_direct_post.create_direct_channel.error", nil, "", http.StatusBadRequest)
 		} else {
 			channel = ch
 		}
 	} else {
 		ch, err := createGroupChannel(userIds, userIds[0])
 		if err != nil && err.Id != store.CHANNEL_EXISTS_ERROR  {
-			return model.NewAppError("BulkImport", "app.import.import_direct_channel.create_group_channel.error", nil, "", http.StatusBadRequest)
+			return model.NewAppError("BulkImport", "app.import.import_direct_post.create_group_channel.error", nil, "", http.StatusBadRequest)
 		} else {
 			channel = ch
 		}

i18n/en.json

@@ -3060,11 +3060,11 @@
     "translation": "Could not find channel member when importing direct channel post"
   },
   {
-    "id": "app.import.import_direct_channel.create_direct_channel.error",
+    "id": "app.import.import_direct_post.create_direct_channel.error",
     "translation": "Failed to get direct channel"
   },
   {
-    "id": "app.import.import_direct_channel.create_group_channel.error",
+    "id": "app.import.import_direct_post.create_group_channel.error",
     "translation": "Failed to get group channel"
   },
   {