XWIKI-13726: Have XWiki displayed as last item in the "Navigation" panel

- Deprecating “xe.xwiki.space” since XWiki.WebHome was the only place
we were using it

xwiki-platform-core/xwiki-platform-oldcore/src/main/resources/ApplicationResources.properties

@@ -3051,7 +3051,6 @@ xe.themes.colors.wizard.reset=Reset
 xe.themes.colors.wizard.close=Close
 xe.themes.colors.wizard.undo=Undo
 
-xe.xwiki.space=XWiki
 xe.xwiki.administration=Administration application
 xe.xwiki.administration.install=This page and its children contain internal content used by XWiki for its own use. It also currently contains the User Profile pages. You can administer your wiki through the {0}.
 
@@ -5010,6 +5009,12 @@ platform.ldap.adminHeadingMiscellaneous=Miscellaneous
 platform.ldap.resetGroupCacheSuccess=Groups cache has been reseted
 platform.ldap.resetGroupCacheButton=Reset group cache
 
+#######################################
+## until 8.3
+#######################################
+
+xe.xwiki.space=XWiki
+
 ## Used to indicate where deprecated keys end
 #@deprecatedend