s/Pieces size/Piece size/ s/uknown/unknown/ Closes #2367.
Now we use QBT_TR(translatable string)QBT_TR.
Torrent comments should not be editable.
Don't reload HTML on tab change. Load the entire structure once and keep the unused bits hidden. Keep also the JS code separately, one file per tab. NOTE: tabs content is not loaded. This will be fixed in the next commit.
