HW 4139: Make channel limits configurable in the System Console (#4154)

* Auto Changes

* 4139 Made channel limits configurable in the System Console as described in the issue

* Removed error message entries from other locales, made maxChannelsPerteam type to pointer

* Added * symbol to maxChannelsPerTeam inside isValid function

* Update team_test.go

* Restored to old test

* Checked maximum number channels per team when creating channel

* Fixed code to pass api/channel_test.go

* Reverted changes on config except MaxChannelsPerTeam

* Update channel.go

* Ran gofmt -w .

* Reverted vendor directoy

webapp/utils/constants.jsx

@@ -818,6 +818,7 @@ export const Constants = {
     WEBRTC_TIME_DELAY: 750,
     WEBRTC_CLEAR_ERROR_DELAY: 15000,
     DEFAULT_MAX_USERS_PER_TEAM: 50,
+    DEFAULT_MAX_CHANNELS_PER_TEAM: 2000,
     MIN_TEAMNAME_LENGTH: 4,
     MAX_TEAMNAME_LENGTH: 15,
     MIN_USERNAME_LENGTH: 3,