Support for non-latin characters in subtitles added (thanks to Github user @vnau)

English is now chosen as subtitle language by default if available.

The search box does not longer stay open when switching videos.
Made the extension compatible with chrome.

Added hotkey for showing and hiding the search window (default is ctrl+shift+f).
Fixed some styling issues.
The search window no longer hides when the timeline of the video hides.
When jumping to a new position in the video the timeline is shown.

It is now possible to search subtitles in all languages that are available for the video.
Added option to choose the subtitle track to search through.
Bug-fixes.