BUG #15509: Pg_Dump failed if Database name contains non asciicharacters

The following bug has been logged on the website:

Bug reference:      15509
Logged by:          vinod tv
Email address:      vinod.t.v@outlook.com
PostgreSQL version: 9.6.10
Operating system:   Windows 10
Description:

Steps:
1) While installing postgres i have selected only Locale [Default Locale]
and install postgres in win10

2) Create a database with non ascii name example : Química Ltda
Script used :-
CREATE DATABASE "Química Ltda"  WITH ENCODING='UTF8'  OWNER postgres
CONNECTION LIMIT=-1;

3) Use command prompt to take a pg_dump
Command used
--host localhost --port 7555 --username postgres --format=d --verbose
--jobs=10 --compress 9 --file "C:\Delete\vt" --dbname "Química"

4) Error thrown 
pg_dump: [archiver (db)] connection to database "Química Ltda" failed:
FATAL:  database "Química Ltda" does not exist

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