This post is a little like programming pop science: an entertaining read, but greatly overstates some small result. The only Turkish-specific problem he mentions is case folding of ı/i. This is a problem unique to Turkish, there are other problems in case folding, like eszett (ß/ss) in German but these are much less likely to trip you up.

The US date format (m/d/y) is used virtually only in US, most other places use d/m/y or y/m/d. -- http://en.wikipedia.org/wiki/Date_format_by_country#Map

Re dots for thousands separators -- the world is split about roughly evenly on this, with all of europe (except for Great Britain and Ireland) using commas for decimals dots for thousands separators. -- http://en.wikipedia.org/wiki/Decimal_mark#Hindu.E2.80.93Arab...