title: WordPress: rename all filenames with special characters and sync with database
body: <p>It just turns out that the web host my client has doesn't allow any filenames with special characters (in this case the Swedish characters å,ä,ö). As they've already prepared the site content and uploaded dozens of images, I need to somehow batch rename these files, as well as sync it with the database. What would be the quickest option, considering I don't have SSH access to the server? What steps are needed to update WordPress for its posts' attachments?</p>
  
  <p>Edit: Tried the plugin Media File Renamer but for some reason it didn't select a single file of those files that had special characters.</p>