Added miss translation part in 6 files., use __()

1. data import page
2. desktop, dialog show all applications
3. message module
4. search box
5. list view
6. core module, description
Actually, there is no need for this. Messages are already translated when received from the server side!
For example, see: https://github.com/frappe/frappe/blob/develop/frappe/config/setup.py