FlaminSarge 0624b5e7d0 For library update error log, group errors by error string, and then sort the resulting list by source (#5586)
Format is
```
! Error
  # Source
    - Manga
```

(cherry picked from commit 8bd965267ce3adfadd201cc4ea24e84a9f92e590)
2021-07-22 15:37:44 -04:00
..
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