Adding {change} to files when propagination.
Adding {change} to files when propagination.

Fix Issue #2428 https://github.com/codecombat/codecombat/issues/2428

So, how it works.
Dev change some line in en.coffee. 
If he add {change} in comment of this line:
* this {change} will be added to all non-en files for this lines
* {change} will be removed from en.coffee

If there is no comment in non-eu - " # {change}" will be added to line
If there is {change} in non-eu already - no doubles of {change}

Old mechanism of syncing comments from en also not broken - if there is a change in comment in eu and {change} in non-eu then new_comment + {change} will be added to non-eu
anonymousch/codecombat,abhisekp/codecombat,jhoon/codecombat,q1ang/codecombat,mads232/codecombat,slacker88/codecombat,anonymousch/codecombat,sarahjean/codecombat,wolut/codecombat,MonkStrom/codecombat,Driphter/codecombat,probil/codecombat,wangjun/codecombat,EmbraceLife/codecombat,codecombat/codecombat,mnogi/codecombat,GraysonP/codecombat-1,teffy/codecombat,jequal/codecombat,jeremyprice/codecombat,jequal/codecombat,nixel2007/codecombat,cherub0526/codecombat,Minhir/codecombat,mads232/codecombat,eschuler21/codecombat,laituan245/codecombat,javatlacati/codecombat,rohmunhoz/codecombat,Layle77/codecombat,trotod/codecombat,sarahjean/codecombat,sarahjean/codecombat,amit2103/codecombat,tpai/codecombat,ingedmundo/codecombat,jeremyprice/codecombat,icodegame/codecombat,tcxhxx/codecombat,jequal/codecombat,MonkStrom/codecombat,lasershow/codecombat,wolut/codecombat,javatlacati/codecombat,rao1219/codecombat,wangjun/codecombat,feifacz/codecombat,edtrist/codecombat,wgsu/codecombat,lasershow/codecombat,cundamic/codecombat,SephVelut/codecombat,geekchy/codecombat,Cooky8197/codecombat,geekchy/codecombat,jacobakkerboom/codecombat,Zacharias030/codecombat,Ye-Yong-Chi/codecombat,rao1219/codecombat,cherub0526/codecombat,jeremyprice/codecombat,GraysonP/codecombat-1,tcxhxx/codecombat,jacobakkerboom/codecombat,VilkkuV/codecombat,MonkStrom/codecombat,wgsu/codecombat,javatlacati/codecombat,Driphter/codecombat,jacobakkerboom/codecombat,jhoon/codecombat,Fokusnica/codecombat,AlanHohn/codecombat,fabichoi/codecombat,zhangxiuquan/codecombat,geekchy/codecombat,jacobakkerboom/CodeCombat2,abhisekp/codecombat,hujianfei1989/codecombat,anirudhnr2015/codecombat,javatlacati/codecombat,slacker88/codecombat,rohmunhoz/codecombat,q1ang/codecombat,q1ang/codecombat,mnogi/codecombat,mnogi/codecombat,hujianfei1989/codecombat,zuihun/codecombat,chooowai/codecombat,jacobakkerboom/CodeCombat2,codecombat/codecombat,tpai/codecombat,cundamic/codecombat,differentmatt/codecombat,Fokusnica/codecombat,Driphter/codecombat,Fokusnica/codecombat,tpai/codecombat,jumarko/codecombat,Layle77/codecombat,fabichoi/codecombat,khoa102/codecombat,edtrist/codecombat,The-Alchemist/codecombat,tuomastanner/codecombat,ecemm/codecombat,justinleoye/codecombat,edtrist/codecombat,Ikuyadeu/codecombat,jequal/codecombat,justinleoye/codecombat,fabichoi/codecombat,bkiehl/lol,leendek/codecombat,zhangxiuquan/codecombat,Akhuta/codecombat,duybkict/codecombat,TsubameDono/codecombat,khoa102/codecombat,zuihun/codecombat,cundamic/codecombat,probil/codecombat,PatrickShelby/codecombat,JordanLittell/codecombat,SephVelut/codecombat,Diprm77/codecombat,dyhpoon/codecombat,icodegame/codecombat,feifacz/codecombat,PatrickShelby/codecombat,yapkn/codecombat,nixel2007/codecombat,dyhpoon/codecombat,EmbraceLife/codecombat,JordanLittell/codecombat,Zacharias030/codecombat,nimda7/codecombat,askeing/codecombat,wolut/codecombat,wangjun/codecombat,mads232/codecombat,jumarko/codecombat,yapkn/codecombat,ReturntoZero/codecombat,anonymousch/codecombat,Layle77/codecombat,nullsquid/codecombat,chooowai/codecombat,slacker88/codecombat,giaba90/codecombat,GraysonP/codecombat-1,kumabotz/codecombat,kidaa/codecombat,kumabotz/codecombat,tuomastanner/codecombat,s2prod/codecombat,Minhir/codecombat,zuihun/codecombat,weevilgenius/codecombat,edtrist/codecombat,zuihun/codecombat,zhangxiuquan/codecombat,askeing/codecombat,hujianfei1989/codecombat,tuomastanner/codecombat,Ye-Yong-Chi/codecombat,differentmatt/codecombat,SephVelut/codecombat,bkiehl/lol,jumarko/codecombat,cundamic/codecombat,laituan245/codecombat,Zerrien/codecombat,Cooky8197/codecombat,giaba90/codecombat,AkaKaras/codecombat,Akhuta/codecombat,kidaa/codecombat,bsmr-x-script/codecombat,ecemm/codecombat,wanchouchou/codecombat,ycaihua/codecombat,teresacream/codecombat,pooky-lin/codecombat,q1ang/codecombat,jeremyprice/codecombat,sarahjean/codecombat,laituan245/codecombat,aashaka/codecombat,JordanLittell/codecombat,Akhuta/codecombat,askeing/codecombat,tuomastanner/codecombat,askeing/codecombat,wanchouchou/codecombat,amit2103/codecombat,nimda7/codecombat,leendek/codecombat,differentmatt/codecombat,Ye-Yong-Chi/codecombat,javatlacati/codecombat,fabichoi/codecombat,Zacharias030/codecombat,dyhpoon/codecombat,wgsu/codecombat,wgsu/codecombat,TeodorMihai/codecombat,wolut/codecombat,EmbraceLife/codecombat,teresacream/codecombat,UltCombo/codecombat,jacobakkerboom/CodeCombat2,Diprm77/codecombat,jacobakkerboom/CodeCombat2,ycaihua/codecombat,Ikuyadeu/codecombat,The-Alchemist/codecombat,mnogi/codecombat,AkaKaras/codecombat,pooky-lin/codecombat,rao1219/codecombat,tcxhxx/codecombat,ilo/codecombat,dyhpoon/codecombat,eschuler21/codecombat,anirudhnr2015/codecombat,pougounias/codecombat,kidaa/codecombat,ilo/codecombat,jhoon/codecombat,ycaihua/codecombat,Minhir/codecombat,wangjun/codecombat,nullsquid/codecombat,codecombat/codecombat,MonkStrom/codecombat,Ye-Yong-Chi/codecombat,AkaKaras/codecombat,bkiehl/lol,EmbraceLife/codecombat,pooky-lin/codecombat,TeodorMihai/codecombat,TsubameDono/codecombat,s2prod/codecombat,ami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