**Feature**
- Adds the following placeholders

```
# Placeholders:
# {current_season} - The current season number.
# {next_season} - The next season number.
# {reward_select_current_page} - The current page number when selecting rewards.
# {reward_select_total_pages} - The total number of pages when selecting rewards.
# {season_select_current_page} - The current page number when selecting seasons.
# {season_select_total_pages} - The total number of pages when selecting seasons.
# {past_season_number} - The number of the past season.
```

**Fixes**
- Players who died, counted as "Active" towards ending the season. This was a problem whenever there was no `hard_end_date` set, causing a season to never end.