remove  translations for unsupported languages

At the moment we are a relatively small community. We don't speak most
languages, which where supported previously. This resulted in a lot of
differences in quality and quantity of our translations.

We happily add languages again, if we find a maintainer for that
language.
Fixes waiting for Ajax in Cucumber:

* old implementation did not actually wait,
  but just checked once whether jQuery or Prototype provided
  any signs of ajaxy activity. It did not actually do anything
  with this information.
* the new implementation waits (busily!) 'til PT and jQuery
  have no signs of ajax anymore. If that takes to long,
  it'll raise Timeout::Error.
Merge branch 'feature/rails3' into feature/rails3_drop_translations_we_cannot_support_at_the_moment
fixes failing cuces
ajax without session gives us a popup.

the popup asks if we want to redirect to the login page.
Adds a test for circular structures.

acts_as_tree does not check for circular structures in the models it is
invoked on.
Disable autocompletion for login forms and password fields
Adds validation concerning circular structures.

Infinite tree fetching no more.
Update CHANGELOG.rdoc
Defer callback registering until after the DOM has loaded.

This is required to enable the callback for AJAX functions in plugins.
Merge pull request #171 from opf/fix/circular-structures

Adds a test and validations for circular structures.
[OPF #907] special version instead of sha1

on admin info page

- moved ChiliProject::Info in OpenProject namespace
updated core special version
[OPF #713] fixes issues description layout

- remove inheritance of font defined in reset.css
- the whole site was affected by this rule, not only the issue
  description
Fixed ambigious cucumber match of login steps
Changed "click on" step to only click on visible elements to prevent
ambigious capybara matches
Removed call to non-existent function formerly removing a line from
a table as the following modify of an existing attribute with the
already-existing line from the table should not cause problems as
long as it is not a key attribute
Disable autocomplete on forms with login password fields

Includes login, register, change password and user admin pages.
Merge pull request #178 from opf/feature/rails3_fix_reset_css

[OPF #713] fixes issues description layout
Merge pull request #177 from opf/feature/rails3_show_full_version_in_admin_info

[OPF #907] special version instead of sha1 on admin info page