[release/3.0] uses Arbeitspaket instead of Ticket

https://github.com/opf/openproject/pull/1521
https://www.openproject.org/work_packages/4936
Merge pull request #1525 from marutosi/finn/Arbeitspaket

[release/3.0] uses Arbeitspaket instead of Ticket
override css method for wiki page by adding overflow: visible
Merge pull request #1537 from opf/hotfix/wiki_menu_cutoff

hotfix/wiki_menu_cutoff
[security] fixed back url verification

--HG--
extra : convert_revision : svn%3Ae93f8b46-1217-0410-a6f0-8f06a7374b81/trunk%4013018
fix protocol-relative redirection test

- escape forward slash in regexp
- allow redirection to home_path '/'
make url redirect tests pass

I don't know why, but the test doesn't pass when both url-tests
are in the same test-method.
When defined in separate test-methods they work fine.
add test for login redirecting to home_url
explicitly allow home path in back_url
using the loop requires logging the user out in-between. using the loop will make it easier to enter more examples.
there was a wrong parenthesis: the last match needs to be ANDed with all the prior checks. instead of changing it, refactored the code to be more clear. still allows redirects to different sub-uris.
we don't need to escape the parameters
convert tests to specs to be able to disable them in plugins
Merge pull request #1541 from opf/backport/1060_1074

Backport/1060 1074
[release/3.0] Tell Travis not to sudo

Signed-off-by: Alex Coles <alex@alexbcoles.com>
Merge pull request #1553 from marutosi/finn/release/3.0/sudo

[release/3.0] Tell Travis not to sudo
Fixes on the fly version creation
Fixes the routing bug of the on-the-fly version create link in the work package form
Check that content_for is cleared
Prevent duplicate output of error messages

The method content_for prepends content on each call and does not remove the
former content. That is why we need to clear content_for before displaying
another error.