LibreOffice stores the title of an user dictionary
only in its file name, but special characters in
file names can result configuration problem for user
dictionaries shipped with LibreOffice.

Optional "title:" field of user dictionaries
supports custom titles with spaces and other UTF-8
characters.

Change-Id: Idbc4c41a2e08f50cfc0fc0d25e960084f5773bec
Reviewed-on: https://gerrit.libreoffice.org/47397Reviewed-by: László Németh <nemeth@numbertext.org>
Tested-by: László Németh <nemeth@numbertext.org>