Add validations to forms

[yatna]

In various forms there are certain problems. eg in edit profile form-

1. 'First name' field can be left empty, it should be made mandatory.
2. 'Mobile Number' allows text too. It should be limited to numbers.
3. 'Email' field allows invalid emails.
   @medhach I would like to add validations to these forms and send a PR.

[GunpreetAhuja]

The first name field is automatically filled with username if left blank. So there is no such issue.

[medhach]

@yatna Send a PR.
@GunpreetAhuja The username and the First name cannot be the same so I think we need to fix it.

[yatna]

Done