Fix git-attributes for **/help/doc/JavaHelpSearch/OFFSETS.

The path in top-level .gitattributes file does not match. Since the
path is quite long I decided to local .gitattributes file down there.
Updates to German translations.
Merge pull request #19 from htgoebel/prefs-and-menus-to-mindmaps

Convert menu-definitions and preferences into mind-maps
Rearrange some preferences.. New tabs: "Advanced", "Im-/Export".

Remove tab HTML (content is now in "Advanced" or "Im/Export".
Save preferences-mindmap without modification-time and folding.
Add translation properties for new preferences tabs.