Merge pull request #941 from nlegoff/fix1684

[3.8] Fix #1684 CSV report are empty
Merge pull request #942 from nlegoff/fix1685

[3.8] Fix #1685 Fix path for report activity
Rename xliff files to xlf
Fix translations to be imported by Pootle
Merge branch '3.8'

Conflicts:
	templates/web/report/report_layout_child.html.twig
Merge pull request #943 from romainneutron/locales

[3.9] Rename xliff files to xlf
Fix latest merge
Fix #1639 logs error in mocha phantom js