Ensure stylesheet is re-rendered when the language changes

This ensures that things like the drop message are updated when the
language changes.

core/ui/PageStylesheet.tid

@@ -2,8 +2,16 @@ title: $:/core/ui/PageStylesheet
 
 <$importvariables filter="[[$:/core/ui/PageMacros]] [all[shadows+tiddlers]tag[$:/tags/Macro]!has[draft.of]]">
 
+<$set name="currentTiddler" value={{$:/language}}>
+
+<$set name="languageTitle" value={{!!name}}>
+
 <$list filter="[all[shadows+tiddlers]tag[$:/tags/Stylesheet]!has[draft.of]]">
 <$transclude mode="block"/>
 </$list>
 
+</$set>
+
+</$set>
+
 </$importvariables>