Update button renaming in phone widget

[AlaaElattar]

Changes

• Adding phone for the first time, the button will be Add.
• Editing the phone, the button will be Update.
• Fixed bug as it was shown Update in the first time of adding the phone.

Related Issues

• Replace "Add" with "Update" or "Save" when changing the phone number #879

Tested Scenarios

• Tested adding phone for the first time.
• Tested updating phone number.