feature 1519: admin instructions are dispatched into several tabs. Only

applied to en_UK and fr_FR. The help content itself needs some updates
but it will be another set of commits, in this commit, I nearly only
modified the container.

The new "Add Photos" help page only introduces you to 3 main ways to add
photos: direct upload, pLoader and FTP. Each of them has a dedicated tab
on the Admin>Photos>Add screen.

No use of the big question mark icon linked to the Help pages in the
administration header, to avoid having this icon twice : in the header
+ in the content next to H2.

git-svn-id: http://piwigo.org/svn/trunk@5182 68402e56-0260-453c-a942-63ccdbb3a9ee

admin/themes/default/default-layout.css

@@ -540,7 +540,7 @@ ul.holder li.bit-box-focus a.closebutton, ul.holder li.bit-box-focus a.closebutt
 }
 
 #pwgHead {
-  background-color:#222;
+  background-color:#464646;
   height:46px;
 }
 
@@ -744,4 +744,8 @@ BODY#thePopuphelpPage {
 h2 { letter-spacing:2px; font-weight:bold;}
 h2:lang(en) { text-transform:capitalize; }
 
-#pluginsMenuSeparator {width:80%; margin:5px auto;}
+#pluginsMenuSeparator {width:80%; margin:5px auto;}
+
+#helpContent P {text-align:left; margin-left:10px;}
+#helpContent LI, #ftpPage LI {margin-top:10px;}
+#helpContent P.nextStepLink {text-align:center; font-weight:bold; margin-bottom:20px;}