The root of the issue is caused by the fact that the user locale was wrongly set or conflicts with the user language. An example of such is when the user locale is in Swiss and the language is US. This can also happen the other way round. The only rare case where this is displayed correctly is in months where the month abbreviation is same in both languages. In the example above, November is abbreviated as Nov. in both US and Swiss and as such this problem will not be noticeable. For more information about months abbreviation in several locales see http://library.princeton.edu/departments/tsd/katmandu/reference/months.html