[EXT JS] Load Grid column headers from db

Bookit.grid.Board = function(config) {
    config = config || {};
    Ext.applyIf(config,{
        id: 'bookit-grid-board'
        ,url: Bookit.config.connectorUrl
        ,baseParams: { action: 'mgr/bookit/getReservations' }
        ,fields: ['id','time', 'item-0']
        ,autosave: true
        ,paging: true
        ,remoteSort: true
        ,enableDragDrop: false
        ,enableColumnMove: false
        ,anchor: '97%'
        ,autoExpandColumn: 'name'
        ,columns: [{
        	header: _('bookit.time')
        	,dataIndex: 'time'
        },{
            header: 'Kurt 1'
            ,dataIndex: 'item-0'
        }]
    });
    Bookit.grid.Board.superclass.constructor.call(this,config);
};