Font recommendations

Ohh, I missed this thread.

Lot of fonts include more than just the latin characters. Specially most of the standard fonts like the classical "Arial".

If you use dynamic fonts for rendering your texts, they will add any character you use into the texture atlas. That way you can set Arial as you font and it will correctly display non latin languages like Arabic and most asian languages.

If you downloaded the font from the internet, most sites (e.g. fonts.com) show the entire character range the font supplies. You will be amazed that most of the time, they not just contain characters but also images.

Check this out:
www.charbase.com/

You could even use some of those special characters to avoid having to supply images for arrows, markers, etc. And at the same time, have those images attlased into the font texture.

Nonetheless, if the font you are using doesn't support some specific language, the I2 localization plugin allows switching the font for specific languages.
So you can have regular languages using your custom font (it could even be a bitmap font) and then use the Arial dynamic font for rendering non-latin languages.