Improve settings UI/UX
What this MR does:
- Rename "Emails" to "Alerts"
- Use tabs instead of a list for each item of the settings
- Use a bold color (same as the text) for the bottom border of the active tab
- Use a dropdown on mobile (the previous stacked thing wasn't usable IMO)
Please bear in mind that one of those tabs (Default parameters) will be removed by !344 (closed) !