New poll slides for motion and assignment. (Fixed #862)

Move result table from assignment slide to assignment poll slide.
Use "result" in singular for motion and election results.
Merge pull request #1232 from emanuelschuetze/pollslide-862

Pollslide for motion and assignment (Fixed #862)
Updated English language files.
Merge pull request #1264 from normanjaeckel/Translation

Updated English language files.
Fix #1253 data table in motion overview displayed incorrectly