Add confirmation block when update or rebuild the model

@eleonel

My apologies, it was my mistake. The button does give feedback and a status message.
I have updated the issue's name and description for the confirmation block as a feature request.

Thank you

@eleonel

Add confirmation block when update or rebuild the model

AND

Improve message to user after execution update/rebuild actions

Is totally a different issue.
Could you please keep these issues for the confirmation block?

@eleonel,

Thank you for your patch.
Patch work, I mark this issue as reviewed.

Although, we could improve the user experience by splitting the confirmation block to another page.

For example;
1. User click the update model button.
2. Drupal send to a confirmation page.
3. User click confirmation block.
4. Model update.

What do you think?