Thank you for the replies.

On CentOS 7 Linux with pgdg 9.5.3 the lower() method works and I have:

 # \l
                                  List of databases
   Name    |  Owner   | Encoding |   Collate   |    Ctype    |
-----------+----------+----------+-------------+-------------+
 postgres  | postgres | UTF8     | en_US.UTF-8 | en_US.UTF-8 |
 template0 | postgres | UTF8     | en_US.UTF-8 | en_US.UTF-8 |
           |          |          |             |             |
 template1 | postgres | UTF8     | en_US.UTF-8 | en_US.UTF-8 |
           |          |          |             |             |
 words     | postgres | UTF8     | en_US.UTF-8 | en_US.UTF-8 |

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