Fixes potential test failure.
Merged r4901 from trunk.
Updated basque and czech translations. Contributed by Ales Zabala Alava and Michal Gebauer.
#7390 depends on this commit.
fix cs.yml lost config/configuration.yml (#7408, #7390, #7507).
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).