Fixed potential issues triggered by Customizations during browser startup.

This is a minor update, removing non-standard JavaScript syntax, which caused warnings in Firefox Aurora and Nightly builds. There are also a few additional changes:

* References to "add-on bar" have been replaced by "toolbar".
* Displaying toolbar icon as text has been disabled in latest Firefox versions, Australis theme doesn't support it.
* Fixed: "Toolbar item display" option keeps switching to default rather than showing the selected value.
* The special icon for "whitelisted" websites has been updated to better match the current Adblock Plus icon.

Added translations: German, Lower Sorbian, Esperanto, Spanish, Finnish, Hebrew, Upper Sorbian, Lithuanian, Portuguese, Russian, Chinese Traditional

* Updated for Adblock Plus 2.1
* Added option to change display of "Non-intrusive ads" filter list
* Removed "Remove Enabled checkbox label" option, Adblock Plus no longer displays that label