Fix errors, potential problems, convention violations logged by Prospector

[sofiapatrocinio]

Refactoring Proposal

Describe the design issue(s) you have identified in the code
Prospector is a tool used for scanning and logging Python code conventions. When the tool was executed under Jandig's code, it logged out a few potential problems that was present on the code. You can see the full tool log here.

Which source files are affected to this issue(s)?
Clear and concise list of relative paths to files that are affected to this issue.

1. etc/scripts/compilemessages.py
2. locustfile.py
3. makefile.py
4. src/ARte/config/jinja2.py
5. src/ARte/config/settings.py
6. src/ARte/config/storage_backends.py
7. src/ARte/config/urls.py
8. src/ARte/config/wait_db.py
9. src/ARte/core/helpers.py
10. src/ARte/core/models.py
11. src/ARte/core/routes.py
12. src/ARte/core/urls.py
13. src/ARte/core/views_s/home.py
14. src/ARte/users/factory.py
15. src/ARte/users/forms.py
16. src/ARte/users/models.py
17. src/ARte/users/services/email_service.py
18. src/ARte/users/services/encrypt_service.py
19. src/ARte/users/services/user_service.py
20. src/ARte/users/urls.py
21. src/ARte/users/views.py
22. tasks.py