"Non-English" covers a lot of ground. If you mean to accept
ISO-8859-1 correctly, that can be done. If you mean other character
sets (including multibyte code like SJIS and EUC) and Unicode, they
can be done also. But currently have to pretty much decide on a single char set
your site is going to be delivered in, and forms data is expected to be in, or else it gets to be quite a bit more work.
For historical reasons, ACS and AOLserver think that 7 bit ASCII
is a reasonable default. But the USA is still using Imperial
units instead of metric, and it doesn't seem to have hurt us
much.
I will try to write up the definitive guide to forcing character sets to work under ACS and AOLserver one of these nights.
In the meantime, checking the bboard will probably help.