message: limit max length in template creation form
diff: name="name"
  floating-label
  autofocus
  + maxlength="255"
  required
  [(ngModel)]="name"
  #nameField="ngModel"
  label="{{ 'DESCRIPTION' | translate }}"
  name="description"
  floating-label
  + maxlength="255"
  required
  [(ngModel)]="displayText"
  #descriptionField="ngModel"
  label="{{ 'URL' | translate }}"
  name="url"
  floating-label
  + maxlength="255"
  required
  pattern="^(http|https):\/\/.*$"
  error-msg="{{ 'INVALID_URL' | translate }}"
  