improved: burn engine. Some (not all) write errors we're false positives
improved: adjust reported unformatted blank disc sizes to expected actual capacity
change: preselect the respective disc size in the size selection dropdown on target page according to inserted disc. As a side effect, discs/drives reporting too large capacity have no negative impact on size output.
fix: Bert's error information on completion page sometimes vanished after a few seconds
fix: automatic disc requester did not show on burn retries (automatically wait for new disc)
minor fixes and improvements
updated languages, added Welsh