Description:
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German weekday abbreviations per %a should be two not three letters wrong. The three letter abbreviations do not exist in German and look like mistakes. They are unusable.

Test script:
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strftime(%a)

Expected result:
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One of the following: 
Mo, Di, Mi, Do, Fr, Sa, So

Actual result:
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One of the following:
Mon, Die, Mit, Don, Fre, Sam, Son