[MODIFY] remove unneccesary code
Revert "[MODIFY] a wrapper for chrome.i18n.getMessage removed from background, because it is slow"

This reverts commit 7923a79d5b671f9525af92cdf1630c95b8ef377c.
[MODIFY] use native chrome.i18n.getMessage in popup.html
[MODIFY] remove all $.clone
Version 0.5.2.8