'de' instead of 'de-DE' in skeletons causes failure in DDIElement:clone

Skeletons in gesisCMM-ddi32 adapted, see https://git.gesis.org/stardat/flatdb-dialectdefinitions/commit/80109568a58e6a254527fa5dd1c2a50cad242f72 and https://git.gesis.org/stardat/flatdb-dialectdefinitions/commit/13b3bbaf2e13f3967b674fc3b9e7b7e37d990ae4

Edited Aug 25, 2020 by Alexander Mühlbauer

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