Added some german translations

Added some german translations
Merged de-DE.
Merge branch 'ehnydeel-patch-1'
Changed the name of incorrectly preloaded old spell palette background texture.
Update sync pvp teams and real-time playback

-Non-creator will switch teams upon joining a sync pvp game, if creator
is on same team
-Team swapping should only affect level session
-Real-time multiplayer submit now reloads PlayLevelView to ease loading
both player’s latest level sessions, and then automatically starts
real-time playback.
Merge branch 'master' of https://github.com/codecombat/codecombat
Set up stripe on the server and site to allow purchases through the website.
Significantly reduced memory usage and simulation time by further limiting the amount of Thangs which even start tracking ThangState in the first place.
Merge branch 'master' into production