Assuming adding Internationalization is mostly a technical problem.
"[Django|Rails|Whatever] templates support i18n, so we're basically done"
Many of the problems in this thread (ignorance of LTR/RTL, address forms, weird validation rules) have their origin in this frame of thought, imho.
And this is not limited to americans. For all intends and purposes, german seems to be english with longer words and weird decimals. Even our umlauts and the ß are on the latin1. We even have federal states to in the address fields, if they're not selectboxes ;)
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