getBootstrapColumnValue(className) {
    if (className) {
      const bootstrapClass = this.getBootstrapColumnClass(className)
      if (bootstrapClass) {
        return parseInt(bootstrapClass.split('-')[2])
      }
    }
    return 0
  }
Return the column size i.e col-md-6 would return 6
@param {string} className
@return {number} Column value between 1-12 or 0 for invalid definitions