Support for --language "de" (German)

[porg]

I'd love to use enca to guess/estimate the character encoding in German plain text files

• from legacy computer systems
• or some CSV exports which do not use UTF-8 but some old single byte encodings and document nowhere which one.

Typically I note it when having broken Umlaut characters then.

[hartwork]

german: ISO-8859-1 would probably be the expected output for enca --list languages. There seems to be some support of ISO 8859-1 a.k.a. Latin-1 at …

https://github.com/nijel/enca/blob/6fc4a2a3e9ec16b892e325f6f53b2501fbcacb17/iconvcap.c#L61C7-L64

…but enca --list charsets does not list 8859-1 🤔

@nijel could you summarize the status quo of the support for ISO 8859-1? Thanks! 🙏