The "us" layout is used throughout the world as a basic layout for Latin character input, widely serving as the primary layout. Labeling it as "USA" and tranlated equivalents doesn't connect well with the global usage of this layout. What will the president of Iran say if his computer displays "USA" on the desktop panel? ;) Suggestion: replace the country-bound connotation of the label with more adjective-meaning origin name, such as "US" in English or an abbreviation for "american" in other languages.
In English, there is _absolutely_ no difference between US and USA. Regarding translations - every translator uses what's more appropriate for his country/language. And historically, it is really US layout. So if someone is using it - he/she should be aware of this fact, even if it is the president of Iran (though I think his personal translator will put shortDescription according to the current political situation). Let's not get too political here.
*** Bug 11938 has been marked as a duplicate of this bug. ***
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