Fixing slack import. (#2819)

i18n/en.json

@@ -667,6 +667,10 @@
     "id": "api.import.import_user.set_email.error",
     "translation": "Failed to set email verified err=%v"
   },
+  {
+    "id": "api.import.import_user.join_team.error",
+    "translation": "Failed to join team when importing err=%v"
+  },
   {
     "id": "api.license.add_license.array.app_error",
     "translation": "Empty array under 'license' in request"
@@ -995,6 +999,10 @@
     "id": "api.slackimport.slack_add_channels.merge",
     "translation": "Merged with existing channel: {{.DisplayName}}\r\n"
   },
+  {
+    "id": "api.slackimport.slack_add_channels.failed_to_add_user",
+    "translation": "Failed to add user to channel: {{.Username}}\r\n"
+  },
   {
     "id": "api.slackimport.slack_add_posts.bot.warn",
     "translation": "Slack bot posts are not imported yet"
@@ -1035,6 +1043,10 @@
     "id": "api.slackimport.slack_import.log",
     "translation": "Mattermost Slack Import Log\r\n"
   },
+  {
+    "id": "api.slackimport.slack_import.team_fail",
+    "translation": "Failed to get team to import into.\r\n"
+  },
   {
     "id": "api.slackimport.slack_import.note1",
     "translation": "- Some posts may not have been imported because they where not supported by this importer.\r\n"