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/components/admin_console/users_and_teams_settings.jsx

@@ -32,6 +32,7 @@ export default class UsersAndTeamsSettings extends AdminSettings {
         config.TeamSettings.RestrictCreationToDomains = this.state.restrictCreationToDomains;
         config.TeamSettings.RestrictTeamNames = this.state.restrictTeamNames;
         config.TeamSettings.RestrictDirectMessage = this.state.restrictDirectMessage;
+        config.TeamSettings.MaxChannelsPerTeam = this.parseIntNonZero(this.state.maxChannelsPerTeam, Constants.DEFAULT_MAX_CHANNELS_PER_TEAM);
 
         return config;
     }
@@ -43,7 +44,8 @@ export default class UsersAndTeamsSettings extends AdminSettings {
             maxUsersPerTeam: config.TeamSettings.MaxUsersPerTeam,
             restrictCreationToDomains: config.TeamSettings.RestrictCreationToDomains,
             restrictTeamNames: config.TeamSettings.RestrictTeamNames,
-            restrictDirectMessage: config.TeamSettings.RestrictDirectMessage
+            restrictDirectMessage: config.TeamSettings.RestrictDirectMessage,
+            maxChannelsPerTeam: config.TeamSettings.MaxChannelsPerTeam
         };
     }
 
@@ -113,6 +115,24 @@ export default class UsersAndTeamsSettings extends AdminSettings {
                     value={this.state.maxUsersPerTeam}
                     onChange={this.handleChange}
                 />
+                <TextSetting
+                    id='maxChannelsPerTeam'
+                    label={
+                        <FormattedMessage
+                            id='admin.team.maxChannelsTitle'
+                            defaultMessage='Max Channels Per Team:'
+                        />
+                    }
+                    placeholder={Utils.localizeMessage('admin.team.maxChannelsExample', 'Ex "100"')}
+                    helpText={
+                        <FormattedMessage
+                            id='admin.team.maxChannelsDescription'
+                            defaultMessage='Maximum total number of channels per team, including both active and deleted channels.'
+                        />
+                    }
+                    value={this.state.maxChannelsPerTeam}
+                    onChange={this.handleChange}
+                />
                 <TextSetting
                     id='restrictCreationToDomains'
                     label={