Warn about subtasks before deleting a parent issue (#6562).
Fixes pt locale (interpolation values is not something to translate).
Japanese translation updated by Go MAEDA (#8169).
Bulgarian translation updated to r5419 by Ivan Cenov (#8027).
Traditional Chinese translation updated to r5437 by ChunChang Lo (#7820).
remove duplicate keys from Traditional Chinese translation.
Traditional Chinese translation updated to r5337 by ChunChang Lo (#7820).
Bulgarian translation updated to r5264 by Ivan Cenov (#8027).
Swedish translation updated by Nicklas Holm (#8036).
Traditional Chinese translation updated to r5294 by ChunChang Lo (#7820).