Fix some issues with database engines :

- insert into syntax not correct for posgresql or sqlite
- add languages table
- incorrect function for row count (sqlite)

git-svn-id: http://piwigo.org/svn/trunk@5452 68402e56-0260-453c-a942-63ccdbb3a9ee

install/db/86-database.php

@@ -56,7 +56,7 @@ foreach ($themes_to_activate as $theme)
 {
   $query = '
 INSERT INTO '.PREFIX_TABLE.'themes
-  SET id = "'.$theme.'"
+  (id) VALUES(\''.$theme.'\'
 ;';
   pwg_query($query);
 }