ODPSH-31: update layout

ckanext/odsh/i18n/de/LC_MESSAGES/ckanext-odsh.mo

ckanext/odsh/i18n/de/LC_MESSAGES/ckanext-odsh.po

ckanext/odsh/plugin.py

ckanext/odsh/public/odsh.css

ckanext/odsh/templates/datarequests/base.html

ckanext/odsh/templates/datarequests/comment.html

ckanext/odsh/templates/datarequests/show.html

...xt/odsh/templates/datarequests/snippets/comment_form.html

...xt/odsh/templates/datarequests/snippets/comment_item.html

ckanext/odsh/templates/datarequests/snippets/comments.html

ckanext/odsh/tests/test_datarequest.py