entry.php: applying splitbrain data #de8b59d by hand

see https://github.com/splitbrain/dokuwiki-plugin-data/commit/de8b59d5b61a686c6e1716bbf8feebf60fd5212f#diff-b7555e11e7eadbc8473306157c69a2f7
helper.php: "revert" to splitbrain's original

splitbrain / Klap-in had another solution for preserving UPPER / lower case distinction, so the former self-made solution (or better: "hack") here is no longer necessary (but might spoil other things)
plugin.info.txt: updating "date"
bureaucracy_field.php: copy of splitbrain's original

Although there should have been NO difference there WERE differences ...
Merge pull request #4 from hh-lohmann/adjust-to-splitbrain-data-plugin

Adjust to splitbrain data plugin including fix for "bureaucracy's" dataplugin