Drop database owned by specific user in PostgreSQL
You could also try this from your shell:

-bash-4.1$ bad_dbname=$(psql -t -q -c "select datname from pg_database where datname like 'bsw_ui%' limit 1")
-bash-4.1$ echo "the next command will drop ${bad_dbname}"
-bash-4.1$ psql -c "drop database ${bad_dbname}"


I verified this works using bash4.1 on centos6.3 with posgresql8.4 for a database using this unicode character. YMMV