* Add function to handle errors

* Delete message errors

* handle error for hideRoom

* Allow returning error instead of calling toastr.error

* Handle error for leaveRoom

* handle error for openRoom

* handleError for toggleFavorite

* handleError in updateMessage

* error for samlLogout

* handleError for assets

* Add global handleError to eslint

* handleError for addOAuthService

* handleError: getUserRoles

* handleError: insertOrUpdateUsere

* handleError: messageDeleting

* handleError: removeUserFromRoles

* handleError: addPermissionToRole

* handleError: addUserToRole

* handleError: deleteRole

* handleError: removeRoleFromPermission

* handleError: removeUserFromRole

* handleError: saveRole

* Return ready on publish without permission

* handleError: channel-settings

* handleError: mailMessages

* handleError: fileUpload

* handleError: rocketchat-importer

* handleError: addIncomingIntegration

* handleError: deleteIncomingIntegration

* handleError: updateIncomingIntegration

* handleError: addOutgoingIntegration

* handleError: deleteOutgoingIntegration

* handleError: updateOutgoingIntegration

* Return ready on publish without permission

* handleError ldap

* remove throw from client code

* handleError: setEmail, slashCommand

* Sort en.i18n.json

* Google translated languages

* Use correct error return from publishes

* RateLimiter.limitFunction

* Fix order of error "500"

* handleError validateEmailDomain

* handleError channelSettings; settings

* handleError livechat

* handleError: Mailer.sendMail

* handleError pinMessage and unpinMessage

* handleError messageStarring

* handleError oauth apps

* handleError: saveNotificationSettings

* handleError getRoomRoles

* handleError: createDirectMessage

* handleError saveUserPreferences

* handleError: saveUserProfile

* handleError sendConfirmationEmail

* Add ecmascript to root

* New user info animation

* Better room's members list show/hide control

* Remove all references to showUserInfo Session variable

* Spread the new role for the user

* New UI for user profile. Also unified view from room and admin

Add missing semicolon

Fix #2634. Admins are warned if they have not verified their e-mail and e-mail verification is true.

now it only on `condition` parameter which implements their
own logic, including checking for permission =)

    If users language setting is different from default app language setting, front end app language should change to user's language once user login
2. Fix the wrong language display in the view of  accountProfile.

Greatly extend the import framework. Implemented the new framework into the slack import and added HipChat import, two examples of how to use the import framework

Add the ability to set the default language for new users.
Admin can set server default language in admin/General section.

This fixes the issue https://github.com/RocketChat/Rocket.Chat/issues/1623

So basically if a user login from a new machine and the language loaded from their profile is different from the local one then set the correct language and if it is an RTL language set the RTL class immediately.

Move the importer to it's own package. Add the slack importer, first version that is missing a few message types and attachments. Need to clean up the ui and add a loading/processing screen.