Browsing Ukrainian translation

The program runs in "stages", which can in many cases be revisited
by the user clicking the "Back" button. If the program has a bug
that allows the user to click "Back" on the initial stage, this
error pops up.

This happens if there's an unusual case when writing out Lua scripts
to disk. This should never be seen by an end-user.

This is triggered by a logic bug in the i/o subsystem.
This should never be seen by an end-user.
"tar" is a proper name in this case (it's a file format).

This is a generic error message when a programming bug produced a
result we weren't expecting (a negative number when we expected
positive, etc...)

Buggy config elements:
This is supposed to be a config element (%0) and something that's wrong
with it (%1), such as "BUG: Config Package::description not a string"
The grammar can be imperfect here; this is a developer error, not an
end-user error, so we haven't made this very flexible.

This is an error string for a buggy config element. See notes above.

bzlib is a proper name. The error message (%0) may not be localized,
it's meant to be a developer error and not an end-user message.

Download rate when we don't know the goal (can't report time left).
This is a number (%0) followed by the localized "KB/s" or "B/s" (%1).

download rate when download isn't progressing at all.

Download progress string: filename (%0), percent downloaded (%1),
download rate determined in one of the above strings (%2).