Irrelevant `else`

Corrects typos in language strings

There is no need to use the `else` since the `if` statement returns implicitly.

Added setting to allow the sending of unrecognized slash commands

Move livechat bundled assets to root app

Display SMTP error messages instead of Internal Server Error

Improve outgoing/incoming webhook logs

Only try to auto orient jpeg, png and bmp files

Closes #2837

Closes #4194

Prevent dirty in outgoing webhook records

More error handling and logs

Closes #4246

And turn email send async

Fix rtl spotlight and prevent line break

Hotfix rtl day divider and unread bar count

Improve upload error message

Search improvements

Prevent update records without query

Add reject unauthorized option to crowd login

Sandstorm: Update meteor-spk for Meteor 1.4