diff --git a/.htaccess b/.htaccess
index 89f503a..9a18ad1 100644
--- a/.htaccess
+++ b/.htaccess
@@ -15,10 +15,17 @@ DirectoryIndex index.php
 
 ###########################################
 # On WAMP one user had to add this line in his httpd.conf
-# None of the abose was working
+# None of the above was working
 ###########################################
 #XSendFilePath <YourCalibrePath>
 
+###########################################
+# If you want to use user based configuration with
+# apache 2.4 + php-fpm enable this
+# https://github.com/seblucas/cops/issues/213
+###########################################
+#SetEnvIf Authorization "(.*)" HTTP_AUTHORIZATION=$1
+
 <IfModule mod_rewrite.c>
 RewriteEngine on
 RewriteRule ^download/(\d*)/(\d*)/.*\.kepub\.epub$ fetch.php?data=$1&db=$2&type=epub [L]
diff --git a/README b/README
index c8f2504..da7314d 100644
--- a/README
+++ b/README
@@ -39,6 +39,9 @@ If you want to use the OPDS feed don't forget to specify feed.php at the end of
 On any Debian base Linux you can use :
  aptitude install php5-gd php5-sqlite php5-json
 
+On Centos you may have to add :
+ yum install php-xml
+
 = Install =
 
 1.  Extract the zip file to a folder in web space (visible to the web server).
diff --git a/base.php b/base.php
index 4f28d87..cd5257a 100644
--- a/base.php
+++ b/base.php
@@ -1201,6 +1201,9 @@ abstract class Base
         global $config;
         if (self::isMultipleDatabaseEnabled ()) {
             if (is_null ($database)) $database = GetUrlParam (DB, 0);
+            if (!is_null($database) && !preg_match('/^\d+$/', $database)) {
+                return self::error ($database);
+            }
             $array = array_keys ($config['calibre_directory']);
             return  $array[$database];
         }
@@ -1211,6 +1214,9 @@ abstract class Base
         global $config;
         if (self::isMultipleDatabaseEnabled ()) {
             if (is_null ($database)) $database = GetUrlParam (DB, 0);
+            if (!is_null($database) && !preg_match('/^\d+$/', $database)) {
+                return self::error ($database);
+            }
             $array = array_values ($config['calibre_directory']);
             return  $array[$database];
         }
@@ -1222,11 +1228,11 @@ abstract class Base
         return self::getDbDirectory ($database) .'metadata.db';
     }
 
-    private static function error () {
+    private static function error ($database) {
         if (php_sapi_name() != "cli") {
             header("location: checkconfig.php?err=1");
         }
-        throw new Exception('Database not found.');
+        throw new Exception("Database <{$database}> not found.");
     }
 
     public static function getDb ($database = NULL) {
@@ -1238,10 +1244,10 @@ abstract class Base
                         self::$db->sqliteCreateFunction ('normAndUp', 'normAndUp', 1);
                     }
                 } else {
-                    self::error ();
+                    self::error ($database);
                 }
             } catch (Exception $e) {
-                self::error ();
+                self::error ($database);
             }
         }
         return self::$db;
diff --git a/lang/Localization_nl.json b/lang/Localization_nl.json
index 011949c..7f78b24 100644
--- a/lang/Localization_nl.json
+++ b/lang/Localization_nl.json
@@ -17,12 +17,12 @@
 "bookword.one":"1 boek",
 "bookword.title":"Boeken",
 "cog.alternate":"Zoeken, sorteren en filters",
-"content.series":"Series:",
-"content.series.data":"Boek {0} in de {1} serie",
+"content.series":"Reeksen:",
+"content.series.data":"Boek {0} in de {1} reeks",
 "content.summary":"Samenvatting",
 "customize.email":"E-mailadres ontvanger (om boeken te versturen per elektronische post)",
 "customize.fancybox":"Gebruik een Lightbox",
-"customize.filter":"Zet filteren op tag aan",
+"customize.filter":"Zet filteren op label aan",
 "customize.ignored":"Niet opgenomen categorieën",
 "customize.paging":"Maximaal aantal boeken per pagina (-1 voor oneindig aantal)",
 "customize.style":"Opmaak COPS gebruikersomgeving",
@@ -62,28 +62,28 @@
 "search.result.author":"Zoekresultaat voor *{0}* in auteurs",
 "search.result.book":"Zoekresultaat voor *{0}* in boeken",
 "search.result.publisher":"Zoekresultaat voor *{0}* in uitgevers",
-"search.result.series":"Zoekresultaat voor *{0}* in series",
-"search.result.tag":"Zoekresultaat voor *{0}* in tags",
+"search.result.series":"Zoekresultaat voor *{0}* in reeksen",
+"search.result.tag":"Zoekresultaat voor *{0}* in labels",
 "search.sortorder.asc":"A-Z",
 "search.sortorder.desc":"Z-A",
-"series.alphabetical.many":"Alfabetische index van {0} series",
-"series.alphabetical.none":"Alfabetische index van absoluut geen enkele serie",
-"series.alphabetical.one":"Alfabetische index van 1 serie",
-"series.title":"Series",
-"seriesword.many":"{0} series",
-"seriesword.none":"Geen series",
-"seriesword.one":"1 serie",
+"series.alphabetical.many":"Alfabetische index van {0} reeksen",
+"series.alphabetical.none":"Alfabetische index van absoluut geen enkele reeks",
+"series.alphabetical.one":"Alfabetische index van 1 reeks",
+"series.title":"Reeksen",
+"seriesword.many":"{0} reeksen",
+"seriesword.none":"Geen reeks",
+"seriesword.one":"1 reeks",
 "sort.alternate":"Sorteren",
 "splitByLetter.book.other":"Andere boeken",
 "splitByLetter.letter":"{0} beginnend met {1}",
-"tags.alphabetical.many":"Alfabetische index van {0} tags",
-"tags.alphabetical.none":"Alfabetische index van absoluut geen enkele tag",
-"tags.alphabetical.one":"Alfabetische index van 1 tag",
-"tags.title":"Tags",
-"tagword.many":"{0} tags",
-"tagword.none":"Geen tag",
-"tagword.one":"1 tag",
-"tagword.title":"Tags",
+"tags.alphabetical.many":"Alfabetische index van {0} labels",
+"tags.alphabetical.none":"Alfabetische index van absoluut geen enkele label",
+"tags.alphabetical.one":"Alfabetische index van 1 label",
+"tags.title":"Labels",
+"tagword.many":"{0} labels",
+"tagword.none":"Geen label",
+"tagword.one":"1 label",
+"tagword.title":"Labels",
 "languages.abk":"Abchazisch",
 "languages.aaf":"Afar",
 "languages.afr":"Afrikaans",