Fix tmp playlist delete, ajax artist edit refresh and similar artists loading
Merge pull request #380 from Psy-Virus/develop

German translation + lang catalog updated due to latest changes :-)
Fix XML error code return with invalid Ampache API handshake (fix #373)
change 'album' to 'albums' for proper grammar
	modified:   locale/ar_SA/LC_MESSAGES/messages.po
	modified:   locale/base/messages.pot
	modified:   locale/ca_ES/LC_MESSAGES/messages.po
	modified:   locale/cs_CZ/LC_MESSAGES/messages.po
	modified:   locale/de_DE/LC_MESSAGES/messages.mo
	modified:   locale/de_DE/LC_MESSAGES/messages.po
	modified:   locale/el_GR/LC_MESSAGES/messages.po
	modified:   locale/en_GB/LC_MESSAGES/messages.po
	modified:   locale/es_ES/LC_MESSAGES/messages.po
	modified:   locale/fa_IR/LC_MESSAGES/messages.po
	modified:   locale/fr_FR/LC_MESSAGES/messages.mo
	modified:   locale/fr_FR/LC_MESSAGES/messages.po
	modified:   locale/it_IT/LC_MESSAGES/messages.po
	modified:   locale/ja_JP/LC_MESSAGES/messages.po
	modified:   locale/nb_NO/LC_MESSAGES/messages.po
	modified:   locale/nl_NL/LC_MESSAGES/messages.po
	modified:   locale/pl_PL/LC_MESSAGES/messages.po
	modified:   locale/ru_RU/LC_MESSAGES/messages.po
	modified:   locale/sv_SE/LC_MESSAGES/messages.po
Merge pull request #395 from ainola/develop

change 'album' to 'albums' for proper grammar
Fix simplexmlelement addchild ampersand escape
Changed video.release_date to signed int.
Merge pull request #406 from wagnered/develop

Changed video.release_date to signed int.