Fix EN on missing_mime_type resolution message
Fix EN on missing_mime_type resolution message

Instead of "you can choose exist", the correct is "you can choose existing".
jackdesert/grape,reprah/grape,franzliedke/grape,reynardmh/grape,nikolai-b/grape,verlinden/grape,zbelzer/grape,elliotlarson/grape,suan/grape,karlfreeman/grape,fuksito/grape,lasseebert/grape,masarakki/grape,phusion/grape,mbleigh/grape,uberjay/grape,fangzhu19880123/grape,danielspector/grape,hpcloud/grape,dblock/grape,jrforrest/grape,krufyliu/grape,Ivanknmk/grape,oliveiradev/grape,alexandru-calinoiu/grape,kiela/grape,virajs/grape,generalassembly/grape,thogg4/grape,maxprig/grape,arunthampi/grape,donbobka/grape,namusyaka/grape,whouses/grape,Nordstrom/grape,ryancheung/grape,shunyam/grape,jtmarmon/grape,marshall-lee/grape,brainyandbrown/grape,fixme/grape,ramarnat/grape,ronald/grape,jlfaber/grape,jerrod/grape,samotarnik/grape,dslh/grape,ctembreull/grape,balasankarc/grape,pvijayror/grape,markgeek/grape,cyberid41/grape,croeck/grape,QuickPay/grape,rnubel/grape,peterwillcn/grape,hnq90/grape,hobofan/grape,xurde/grape,intridea/grape,yonglehou/grape,tildeio/grape,tylerdooling/grape,klaustopher/grape,rubyinhell/grape,gencer/grape,LIQIDTechnology/grape,niedhui/grape,sideci-sample/sideci-sample-grape,ferdinandrosario/grape,cutalion/grape,ruby-grape/grape,balauru/grape,edelgado/grape