Cleanup (#12050).
Fixed that export: links are broken (#12050).
Merged r10572 from trunk
add missing fixtures to test/unit/issue_relation_test.rb
Merged r10571 from trunk
add missing fixture to test/integration/api_test/issues_test.rb
Traditional Chinese translation updated by ChunChang Lo (#12042)
code layout cleanup test/integration/api_test/issues_test.rb
code layout cleanup test/unit/issue_relation_test.rb
