Update to v2.15

Improved performace of extension when using the Malware filter list (#384)
Added the 'show the resource list' page to the Safari version of the extension (#385)
Added a timestamp to the JavaScript error text that is save in local storage (#390)
Added logic to determine the correct URL for the Filter list syntax link on the Custom tab based on the user's language (#387)
Updated the Japaneese filter list URL (#386)