Fix sed parsing on invalid UTF-8 byte sequence
Fix sed parsing on invalid UTF-8 byte sequence

sed wouldn’t convert lines that contains invalid UTF-8
byte sequences. Some do, problably when browsers send
search queries in unexpected encondings.

Tatoeba/tatoeba2,Tatoeba/tatoeba2,Tatoeba/tatoeba2,Tatoeba/tatoeba2,Tatoeba/tatoeba2