use includes instead of joins at Issue#visible

"rake test" passes all test, but following test fails on command line.

<pre>
$ ruby test/unit/issue_test.rb -n test_visible_scope_for_member_with_groups_should_return_assigned_issues

  1) Failure:
IssueTest#test_visible_scope_for_member_with_groups_should_return_assigned_issues [test/unit/issue_test.rb:321]:
Failed assertion, no message given.
</pre>

git-svn-id: http://svn.redmine.org/redmine@13500 e93f8b46-1217-0410-a6f0-8f06a7374b81
remove unneeded "references" of joins

"references" is needed for includes, but not needed for joins.

git-svn-id: http://svn.redmine.org/redmine@13501 e93f8b46-1217-0410-a6f0-8f06a7374b81
fix ja.yml and zh-TW.yml merge mistake of r13482 (#14534)

git-svn-id: http://svn.redmine.org/redmine@13502 e93f8b46-1217-0410-a6f0-8f06a7374b81
add missing fixtures to CalendarsControllerTest

Tests fail randomly.

<pre>
  1) Error:
CalendarsControllerTest#test_cross_project_calendar:
ActionView::Template::Error: undefined method `name' for nil:NilClass
    app/helpers/issues_helper.rb:57:in `render_issue_tooltip'
    app/views/common/_calendar.html.erb:17:in `block in _app_views_common__calendar_html_erb__4084073314711523042_57686480'
    app/views/common/_calendar.html.erb:12:in `each'
    app/views/common/_calendar.html.erb:12:in `_app_views_common__calendar_html_erb__4084073314711523042_57686480'
    app/views/calendars/show.html.erb:30:in `_app_views_calendars_show_html_erb___1639405444546230501_53808060'
    test/functional/calendars_controller_test.rb:44:in `test_cross_project_calendar'
</pre>

git-svn-id: http://svn.redmine.org/redmine@13503 e93f8b46-1217-0410-a6f0-8f06a7374b81