[PLT-6655] Remove 1024 character limit with text settings at system console, except sitename of custom branding (#6597)

* remove 1024 character limit with text settings at system console, except sitename of custom branding

* add ability to set textarea of TextSetting

webapp/components/admin_console/text_setting.jsx

@@ -6,7 +6,6 @@ import PropTypes from 'prop-types';
 import React from 'react';
 
 import Setting from './setting.jsx';
-import Constants from 'utils/constants.jsx';
 
 export default class TextSetting extends React.Component {
     static get propTypes() {
@@ -32,7 +31,7 @@ export default class TextSetting extends React.Component {
     static get defaultProps() {
         return {
             type: 'input',
-            maxLength: Constants.MAX_TEXTSETTING_LENGTH
+            maxLength: null
         };
     }
 
@@ -67,9 +66,9 @@ export default class TextSetting extends React.Component {
                     id={this.props.id}
                     className='form-control'
                     rows='5'
-                    maxLength='1024'
                     placeholder={this.props.placeholder}
                     value={this.props.value}
+                    maxLength={this.props.maxLength}
                     onChange={this.handleChange}
                     disabled={this.props.disabled}
                 />

webapp/utils/constants.jsx

@@ -931,7 +931,6 @@ export const Constants = {
     MAX_POSITION_LENGTH: 35,
     MIN_TRIGGER_LENGTH: 1,
     MAX_TRIGGER_LENGTH: 128,
-    MAX_TEXTSETTING_LENGTH: 1024,
     MAX_SITENAME_LENGTH: 30,
     TIME_SINCE_UPDATE_INTERVAL: 30000,
     MIN_HASHTAG_LINK_LENGTH: 3,