\def\isodoc@enUS{%
  \gdef\paymentdatatext {Payment details}
  \gdef\accountnametext {in the name of}
  \gdef\accountnotext   {Account no.}
  \gdef\amounttext      {Amount}
  \gdef\bictext         {\scshape bic}
  \gdef\cellphonetext   {cellphone}
  \gdef\chambertext     {ch.comm.}
  \gdef\copytotext      {cc}
  \gdef\datetext        {Date}
  \gdef\daystext        {days}
  \gdef\descriptiontext {Description}
  \gdef\emailtext       {email}
  \gdef\enclosurestext  {Enclosures:}
  \gdef\enclosuretext   {Enclosure:}
  \gdef\faxtext         {telefax}
  \gdef\ibantext        {\scshape iban}
  \gdef\invoicetext     {invoice}
  \gdef\oftext          {of}
  \gdef\ourreftext      {Our reference}
  \gdef\pagetext        {Page}
  \gdef\phonetext       {telephone}
  \gdef\referencetext   {Reference}
  \gdef\routingnotext   {Routing no}
  \gdef\subjecttext     {Subject:}
  \gdef\termtext        {term of payment}
  \gdef\totaltext       {Total}
  \gdef\totext          {To}
  \gdef\vatnotext       {vat no.}
  \gdef\vattext		{Vat}
  \gdef\websitetext     {website}
  \gdef\yourlettertext  {Your letter of}
  \gdef\yourreftext     {Your reference}
  \gdef\@isodate        {\ifcase\month\or
    January\or February\or March\or April\or May\or June\or
    July\or August\or September\or October\or November\or December\fi
    \space\number\day, \number\year}
}
\def\isodoc@american{\isodoc@enUS\ClassWarning{isodoc}{language name american is obsolete: use en-US}}