BUG #7768 - add-button and breadcrumb translation in Security, ModelAdmin

The classnames on the add-new button and breadcrumbs were not
translated due to the use of singular_name() instead of
i18n-singular_name() in GridFieldAddNewButton and GridFieldDetailForm.
CMS Localization
BUG Localize DataObject->summaryFields()
CMS Localization
Merge branch '3.0'
GridFieldPaginator localization
Merge branch '3.0'
Updated language master files
MINOR Updated translations
FIXED: Issue where viewing an archived version of a page caused invalid SQL to be generated. This would only occur with subclasses of Page.
FIXED: Issue where versioned would join _versions tables on ID,Version instead of RecordID,Version
MINOR Updated translations
FIX: Missing last login time (fixes 7666)

Add in missing user login time
BUG removed use of deprecated method
BUG prevent notice when using selection group
BUG Consistently self-closing form field tags (#7557)

This is reverting templates back to pre-3.0 conventions,
which were dominated by XHTML templates.
HTML5 allows both self-closing and unclosed tags,
so opting for self-closing to achieve maximum compatibility.
Merge pull request #667 from jakr/trac7617-followup

Fix edge case in sessionStorage detection for FireFox.
MINOR Updated translations
MINOR Updated translations
FIX: Proper buttonset styling