Big update:
- Add more than 40 nicknames
- Change the way nicknames are given
- Change the nicknames already existing

- Add 56 new nicknames

- Correct on_birthday bug
- Changed the epithet "Little Orphan"

Big Epithet overhaul

- Change the way each epithet are earned.
- Especially for cultural/religious epithet
- Add several new epithets

Change the probabilities of gaining a nickname.

Add Chinese translation thanks to Juijote

- Add new rule for Epithet Frequency
- Change percentage of gaining an epithet

- Add new nicknames
- Fix localization error
- Fix IDs error
- Clean the code