[ticket/9905] Add SQLite to the DSN description

The installer's DSN field has additional meanings for ODBC, PostgreSQL, and
SQLite, but only the first two are mentioned. SQLite uses it for the file path.

PHPBB3-9905

phpBB/language/en/install.php

@@ -128,7 +128,7 @@
 	'DB_ERR_QUERY_FIRST_TABLE'	=> 'Error while executing <var>query_first</var>, %s (“%s”).',
 	'DB_ERR_SELECT'				=> 'Error while running <code>SELECT</code> query.',
 	'DB_HOST'					=> 'Database server hostname or DSN',
-	'DB_HOST_EXPLAIN'			=> 'DSN stands for Data Source Name and is relevant only for ODBC installs. On PostgreSQL, use localhost to connect to the local server via UNIX domain socket and 127.0.0.1 to connect via TCP.',
+	'DB_HOST_EXPLAIN'			=> 'DSN stands for Data Source Name and is relevant only for ODBC installs. On PostgreSQL, use localhost to connect to the local server via UNIX domain socket and 127.0.0.1 to connect via TCP. For SQLite, enter the full path to your database file.',
 	'DB_NAME'					=> 'Database name',
 	'DB_PASSWORD'				=> 'Database password',
 	'DB_PORT'					=> 'Database server port',