button to restore site_upgrade files to default
SK translation update

Partial update. 50+ lines not translated
fix #759
french translation update
fix bug in reporting not supported locales
Fixes broken main gallery sidebar link on Zenpage theme
German update
Best I can do to fix #745 for now.
disable locales not supported by the server
Merge remote-tracking branch 'origin/master' into 1.4.7

Conflicts:
	zp-core/locale/de_DE/LC_MESSAGES/zenphoto.mo
	zp-core/locale/de_DE/LC_MESSAGES/zenphoto.po