Updated English language files.
Merge pull request #1259 from normanjaeckel/Translation

Updated English language files.
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.
Add get_win32_portable_user_data_path() function in main.py to return
correct user data path ("/openslides") of portable version.
Automatically load plugins from portable plugins dir; closes #1178

All modules/ packages in the openslides/plugins subdirectory of the
portable version will be automatically added to INSTALLED_PLUGINS
Update copyright to 2014