Inconsistent window text when testing archive

[vudu]

Hi all,

Just to report a small inconsistency in 8.51 (x64, probably it's also in x86).

When testing previously supported archive formats (ZIP, RAR, maybe others), window text displays "Verify (CRC check)" as expected. When testing 7zip archives, it shows "Unpack".

Most probably the same routine is used in the program for both unpacking and testing (with some flag indicating whether to actually write files into filesystem or not), but it should be fixed anyway to avoid confusion.