Added maxlength for nicknames (#3186)

webapp/components/user_settings/user_settings_general.jsx

@@ -681,6 +681,7 @@ class UserSettingsGeneralTab extends React.Component {
                                 type='text'
                                 onChange={this.updateNickname}
                                 value={this.state.nickname}
+                                maxLength={Constants.MAX_NICKNAME_LENGTH}
                                 autoCapitalize='off'
                             />
                         </div>

webapp/utils/constants.jsx

@@ -739,6 +739,7 @@ export default {
     MAX_TEAMNAME_LENGTH: 15,
     MIN_USERNAME_LENGTH: 3,
     MAX_USERNAME_LENGTH: 22,
+    MAX_NICKNAME_LENGTH: 22,
     MIN_PASSWORD_LENGTH: 5,
     MAX_PASSWORD_LENGTH: 50,
     MIN_TRIGGER_LENGTH: 1,