Hello I think you can change categories name for blogs into : modules/boonex/blogs/install/install.sql
find these strings :
-- categories
INSERT INTO `sys_categories` (`Category`, `ID`, `Type`, `Owner`, `Status`) VALUES
('Baby Blogs', 0, '[db_prefix]', 0, 'active'),
('Blogging for Money', 0, '[db_prefix]', 0, 'active'),
('Books', 0, '[db_prefix]', 0, 'active'),
('City Blogs', 0, '[db_prefix]', 0, 'active'),
('Dating and Personals', 0, '[db_prefix]', 0, 'active'),
('Entertainment Blogs', 0, '[db_prefix]', 0, 'active'),
('Food Blogs', 0, '[db_prefix]', 0, 'active'),
('Games', 0, '[db_prefix]', 0, 'active'),
('Health', 0, '[db_prefix]', 0, 'active'),
('Holidays', 0, '[db_prefix]', 0, 'active'),
('Lifestyle', 0, '[db_prefix]', 0, 'active'),
('Movies', 0, '[db_prefix]', 0, 'active'),
('Music', 0, '[db_prefix]', 0, 'active'),
('Politics', 0, '[db_prefix]', 0, 'active'),
('Tech News', 0, '[db_prefix]', 0, 'active'),
('Videos', 0, '[db_prefix]', 0, 'active');
and replace with what you need!
and reinstall the module