Fix translations added to wrong locale in e594de82

Signed-off-by: Alex Coles <alex@alexbcoles.com>
Really outdated net-ldap gem fails with Apache DS

The really outdated net-ldap gem fails with Apache DS.
See https://community.openproject.org/topics/1013.
Merge pull request #2203 from MichaelHierweck/fix/net-ldap-dependency

Really outdated net-ldap gem fails with Apache DS
Add spent time WP property to documentation
Test API V3's WP response contains spent time
Add WP spent time property
Handle spent time correctly in overview
Test estimated time value
Move estimated time to representer
Estimated time isn't writeable over the API V3
Test that estimated/spent time return ISO8601 duration
Add ruby-duration dependency
Return ISO8601 duration strings
Fix missing dependency
Handle ISO8601 duration strings in front-end