Add better German wordlists

[d2ro]

We have created decent German wordlists and propose to add them to xkcdpass. They follow specific rules:

short list (1296 words)

• words have 4-8 characters
• words are unique after four characters
• no German special characters ä, ö, ü, ß
• prefer familiar words in their basic form
• no proper names, regions, religions, organizations, persons
• no offensive words
• prefer generic masculine (this is debatable, however the list has initially been created for Bitcoin BIP-39, where that's default, so we sticked with that)

long list (7776 words)

• words have 3-12 characters
• same as above, except the uniqueness after four characters

Multi-licensed under Unlicense, CC0 and BSD-3.