Resources modals consistency

[noirbizarre]

This PR adds some consistency to the resources modals:

Only show save button when form is shown

The "Add resource" modal "Save" button is only shown when the form is shown too, this prevent form validation when the form isn't present yet.

Before

After

Wide modal when editing

The modal become wide when the form shown:

• prevent most fields from spanning on 2 lines
• allow form to fill in the page and avoid scrolling to see buttons

Description fields has also been reduced from 6 to 3 lines

Before

After

Same buttons design and order

Both modals have now the buttons design and order: Cancel buttons is on the left and smaller, actions on the right, outlined

Before

Add modal

Edit modal

After

Add modal

Edit modal