Updated french translations
I fixed inconsistencies about :
- Padding
- Notification popup positioning
- Activities button
- App menu
- Just perfection's menu entries and file picker
- Search
- Dash
- Weather
- Keyboard layout
- Super key
I also tweaked strings for "default", "override" and "no matches".
They were not wrong but seemed a little bit off.
Feel free to message me if you need me to change things, or when you plan on doing a release in the future