Release new version 2.15

+2.15: 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)
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