feat: add British Juniors
British Juniors has just finished and we have received all the results, so this concatenates all the days and fixes up the issues.
This change:
- Adds British Juniors, the recent 5 day competition at GLC
- Disambiguates all the required lifters
- Updates the capitalisation of various lifters
- Makes sure everyone gets nice country interpolation
Closes #15536.
Edited by Alexander Jackson