Updated translations
Using new "Security.login_url" configuration value
Reduced code duplication in ErrorPage (no functional changes)
Merge remote-tracking branch 'origin/3.0' into 3.1
Extracted ErrorPage default data to getter

Allows for less verbose overloading, while still keeping i18n capabilities
in place, which isn't possible with DataObject::$default_records
Excluded Postgres from Travis (breaks build due to internal errors)

We'll need to fix the "no space left on device" issue,
most likely caused by Postgres keeping too much of a query log,
or somehow creating a history of past data.
For now, having a Postgres build breaking the whole
build process (incl. MySQL builds) does more harm than good.
Merge remote-tracking branch 'origin/3.0' into 3.1
NEW Clickable URL preview in CMS

- Refactored SiteTreeURLSegmentField to render controls in template
rather than JS for better clientside performance, and cleaner behaviour.
- Added dynamic ellipsis to start of URL, to retain most relevant
part of the URL (the last bits)
- Added "suffix" setting to field, which defaults to ?stage=Stage
- Removed prefix from edit view to leave more room for URL

Thanks to @sunnysideup for getting this started in
https://github.com/silverstripe/silverstripe-cms/pull/269
BUG: Prevent conflict when using multiple SiteTreeURLSegmentField's in CMS edit form
Merge pull request #285 from ryanwachtl/bug-8032-multiple-urlsegment-fields

Prevent conflict when using more than one SiteTreeURLSegmentField in a CMS edit form