Subtitles for LibreOffice 5.2 New Features videos

Hi everyone,

Thanks to the contributions of the community we now have subtitles for these videos:

Click the cog button at the bottom to enable subtitles in these languages:

* English (original script)
* Russian
* Chinese (Taiwan)
* Spanish
* Portuguese (Brazil)

One line is missing from the Russian General video (I've requested it from the original translator), and regarding German videos, I'm doing those separately with dedicated audio.

Native speakers of the above foreign languages, please check that the subtitles are OK, and then we can share the links with the public. Thanks!