turbobit (download, probe): alternate way to parse file name

The file name inside the page gets truncated when its too long.
Inside the site's title this does not seem to happen.
core (translate_size): workaround for BusyBox sed

see commit 37949eade6b5717b4b9efd034ad77eb033abe724
download.sh: add sanity check (strip \r in final filename)
uploading (download): fix, upstream modified