No status indicator when deleting a Contact

[weaponsforge]

Description

This Issue is similar in nature to #126 .

We should display more informative status indicators to users when deleting a Contact:

• Disable the first_name, last_name, phone_no and other Contacts input fields and the SAVE CHANGE button after pressing the DELETE button
• Display a loading indicator after pressing the DELETE button

Please view the attached video of the current Delete Contact process for reference.

Video: Uninformative Delete Contact process

(The Network speed was throttled to Slow 3G to simulate a slow internet speed.)

contacts-delete.mp4