Closes #4177

* 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