Improve German translations

[georgd]

No description provided.

[fbennett]

Following Zotero, the schema is built by a script that pulls the terms from the Jurism locale file zotero.properties, which supplies field labels both as itemFields (that turn up here) and as searchConditions (that turn up in the search menus). The changes here would be overwritten at the next schema update, so I've done a rough little script to write them across, and run it against the PR. Updates by hand in zotero.properties can be a headache, so I'm attaching the script in case it comes in handy later on.
FIXUP.zip

[georgd]

Except for the occasional headache, is anything speaking against me doing PRs for zotero.properties against Juris-M/zotero? Would you prefer it somehow else?
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