Don't display extra comma at the end

Was fixed in PHP at bc86625e753f56f4a8a5dd4444d5551787e1df92
Don't display Senate leaders & deputy speaker in list of parties

Was fixed in PHP at e5e25deedd2cc0772dea9ca01f1b84694344ca74
Change "Rôle" to "Role"
Add CSS changes from PHP app to Rails
Support displaying MPs from both houses
Allow the Rails app to show MPs from different parliaments
Remove duplicate function