I'm using wpmu with non-english installation. Some letters doesn't display correctly for themes with various fonts. The only way to display them correctly is to set "font-family" to "Arial" in CSS files. Currently I have 100 themes on my site and I changed CSS of those themes manually. I plan to add more themes and wondering if there is any way to set fonts of all themes to Arial. In following plugin, author claims the plugin is able to set all fonts sitewide:
http://wpmudevorg.wordpress.com/project/Global-Theme-Options
Above plugin is per user and also allows changing of CSS, so I think it may have some security issues. I want to override font settings of all themes as site admin, so I would be very grateful if someone suggests how to do it.
Thank you in advance.