some code comments

git-svn-id: http://piwigo.org/svn/trunk@19878 68402e56-0260-453c-a942-63ccdbb3a9ee
[trunk_upgrade] Update nl_NL, thanks to : Kees Hessels

git-svn-id: http://piwigo.org/svn/trunk@19881 68402e56-0260-453c-a942-63ccdbb3a9ee
[trunk_public] Update nl_NL, thanks to : Kees Hessels

git-svn-id: http://piwigo.org/svn/trunk@19882 68402e56-0260-453c-a942-63ccdbb3a9ee
[trunk_admin] Update nl_NL, thanks to : Kees Hessels

git-svn-id: http://piwigo.org/svn/trunk@19883 68402e56-0260-453c-a942-63ccdbb3a9ee
[trunk_admin] Update fi_FI, thanks to : Juhi24

git-svn-id: http://piwigo.org/svn/trunk@19887 68402e56-0260-453c-a942-63ccdbb3a9ee
[trunk_admin] Update ja_JP, thanks to : ryoon

git-svn-id: http://piwigo.org/svn/trunk@19889 68402e56-0260-453c-a942-63ccdbb3a9ee
[trunk_install] Update ja_JP, thanks to : ryoon

git-svn-id: http://piwigo.org/svn/trunk@19890 68402e56-0260-453c-a942-63ccdbb3a9ee
[language_switch] Update ja_JP, thanks to : ryoon

git-svn-id: http://piwigo.org/svn/trunk@19891 68402e56-0260-453c-a942-63ccdbb3a9ee
[trunk_public] Update nl_NL, thanks to : Kees Hessels

git-svn-id: http://piwigo.org/svn/trunk@19916 68402e56-0260-453c-a942-63ccdbb3a9ee
[trunk_admin] Update nl_NL, thanks to : Kees Hessels

git-svn-id: http://piwigo.org/svn/trunk@19917 68402e56-0260-453c-a942-63ccdbb3a9ee
[trunk_upgrade] Update nl_NL, thanks to : Kees Hessels

git-svn-id: http://piwigo.org/svn/trunk@19918 68402e56-0260-453c-a942-63ccdbb3a9ee
feature:2718 errors when no photo on the gallery, use arbitrary values instead

git-svn-id: http://piwigo.org/svn/trunk@19920 68402e56-0260-453c-a942-63ccdbb3a9ee