Add address field for envelope type "DIN lang mit Fenster"#3

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sloede wants to merge 2 commits intoDE-RSE:masterfrom

sloede:adressfenster

Commits on Jun 11, 2019

Add address field for envelope type "DIN lang mit Fenster" for convenient posting
sloede
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Add possible cover letter for sending the application form via snail mail to an interested party
sloede
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