Add required in input fields of ChangePassword form.

[rupav]

I'm submitting a ... (check one with "x")

• [ ] bug report
• [x] feature request
• [ ] support request => Please do not submit support requests here, instead ask your query in out Gitter channel at https://gitter.im/fossasia/susi_server

Current behavior:

Currently on submitting empty fields, no error shows up. Expected behavior:

Error/alert should be present to indicate the required fields. Steps to reproduce:

Log in, then click on 'Change password' in the login page.

Would you like to work on the issue? Yes

[rupav]

@zamhaq adding required field in the input tags will do. But in forget password form, there is an alert for empty field (Email). Should I change in that too?