Reworked website for 1.4 release.
Added new screenshots.
Reworked feature page.
Thanks to Andy for English translation!
Merge pull request #7 from emanuelschuetze/1.4

Reworked website for 1.4 release.
Added 1.4 announcement. Added missing plugin licenses.
Fixed typo in tranlsation tag.
Fixed a lot of typos (in German version).
Merge pull request #8 from emanuelschuetze/working

Fixed a lot of typos (in German version).
Fixed typos.
Added requirements.txt. (Fixed #6)
Make strings translateable. Update po file.
Added German po source file (for transifex).
Added last news about OpenSlides 1.4. Restructured news section.
Merge pull request #9 from emanuelschuetze/working

Translations, typos and news