refactor: parameterize the root prefix number of characters To make i18n work on windows, we need to clean the three character root elements(drive letter, colon, backslash) from the front of the various paths. Parameterize the number of chars. Old way hard coded to 1, which leaves :/ in the path and generates bad LOCALE_DIRS. From issues getting Roundup running on windows discussed on mailing list by Simon Eigeldinger. Thread starts with: https://sourceforge.net/p/roundup/mailman/message/41557096/ subject: Installing Roundup on Windows 2023-10-05.

# human timezones
pytz
# indexer
Whoosh
# xapian is also installed
# extra database support
psycopg2
mysqlclient
redis
# encryption
gpg
# java web tokens
PyJWT
# extra HTTP compression methods
Brotli
zstd
# jinja2 template engine
Jinja2