Move search result count logic out of translations

Also fixes a problem pointed out by @Evolena whereby the advanced
search counts hadn’t been adjusted to remove `$:/temp/advancedsearch`
from the search.

core/ui/AdvancedSearch/System.tid

@@ -13,6 +13,8 @@ caption: {{$:/language/Search/System/Caption}}
 
 <$reveal state="$:/temp/advancedsearch" type="nomatch" text="">
 
+<$set name="resultCount" value="""<$count filter="[is[system]search{$:/temp/advancedsearch}] -[[$:/temp/advancedsearch]]"/>""">
+
 <div class="tc-search-results">
 
 <<lingo System/Matches>>
@@ -21,6 +23,8 @@ caption: {{$:/language/Search/System/Caption}}
 
 </div>
 
+</$set>
+
 </$reveal>
 
 <$reveal state="$:/temp/advancedsearch" type="match" text="">