The first part of the locale is the language, not the country; but this is

The first part of the locale is the language, not the country; but this is
what we want to use anyway, so fix the variable name.
We might want to ucfirst() all locale parts, so that a country-specific locale
(e.g. for de_AT) would result in a class name
Horde_Support_Numerizer_Locale_De_At.