fixes latex2html issue

bibacid-utf8.bib

@@ -223,3 +223,4 @@ MRREVIEWER = {Jean-Fran{\c{c}}ois Clouet},
   title = "Fancy accents bug",
   year = 2015
 }
+

bibtexbrowser-test.php

@@ -462,6 +462,7 @@ class BTBTest extends PHPUnit_Framework_TestCase {
     
     function test_latex2html() {
         $this->assertEquals('é', latex2html("\'e"));    
+        $this->assertEquals('é', latex2html("{\'e}"));    
     }
 
     function test_homepage_link() {

bibtexbrowser.php

@@ -927,7 +927,8 @@ class BibDBBuilder extends ParserDelegate {
       $this->builtdb[$this->currentEntry->getKey()] = $this->currentEntry;
     }    
   }
-  
+
+
   function entryValuePart($key, $value, $type) {
     if (preg_match('/^author$/i',trim($key)) && strlen($value)>0) {
       if ($type == 'CURLYTOP') {
@@ -941,6 +942,7 @@ class BibDBBuilder extends ParserDelegate {
       }
     }
   }
+  
 } // end class BibDBBuilder
 
 
@@ -973,11 +975,7 @@ function char2html($line,$latexmodifier,$char,$entitiyfragment) {
 }
 
 function char2html_case_sensitive($line,$latexmodifier,$char,$entitiyfragment) {
-// old version
-//   $line = str_replace('\\'.$latexmodifier.$char,'&'.$char.''.$entitiyfragment.';', $line);
-//   $line = str_replace('\\'.$latexmodifier.' '.$char,'&'.$char.''.$entitiyfragment.';', $line);
-//   $line = str_replace('\\'.$latexmodifier.'{'.$char.'}','&'.$char.''.$entitiyfragment.';', $line);
-  $line = preg_replace('/\\\\'.preg_quote($latexmodifier,'/').' ?\\{?'.$char.'\\}?/','&'.$char.''.$entitiyfragment.';', $line);
+  $line = preg_replace('/\\{?\\\\'.preg_quote($latexmodifier,'/').' ?\\{?'.$char.'\\}?/','&'.$char.''.$entitiyfragment.';', $line);
   return $line;
 }