Add test for generation of multilingual book
Add test for generation of multilingual book

xxxhycl2010/gitbook,athiruban/gitbook,tzq668766/gitbook,2390183798/gitbook,JohnTroony/gitbook,jocr1627/gitbook,hujianfei1989/gitbook,npracht/documentation,hujianfei1989/gitbook,iamchenxin/gitbook,gdbooks/gitbook,youprofit/gitbook,webwlsong/gitbook,grokcoder/gitbook,jocr1627/gitbook,megumiteam/documentation,ferrior30/gitbook,nycitt/gitbook,palerdot/gitbook,boyXiong/gitbook,iflyup/gitbook,strawluffy/gitbook,bradparks/gitbook,iamchenxin/gitbook,CN-Sean/gitbook,webwlsong/gitbook,kamyu104/gitbook,boyXiong/gitbook,mautic/documentation,minghe/gitbook,tzq668766/gitbook,switchspan/gitbook,intfrr/gitbook,hongbinz/gitbook,hongbinz/gitbook,wewelove/gitbook,snowsnail/gitbook,ZachLamb/gitbook,alex-dixon/gitbook,lucciano/gitbook,thelastmile/gitbook,minghe/gitbook,xcv58/gitbook,2390183798/gitbook,gencer/gitbook,qingying5810/gitbook,shibe97/gitbook,youprofit/gitbook,iflyup/gitbook,kamyu104/gitbook,shibe97/gitbook,gdbooks/gitbook,sudobashme/gitbook,palerdot/gitbook,lucciano/gitbook,OriPekelman/gitbook,tshoper/gitbook,GitbookIO/gitbook,alex-dixon/gitbook,snowsnail/gitbook,gaearon/gitbook,haamop/documentation,gaearon/gitbook,escopecz/documentation,sudobashme/gitbook,a-moses/gitbook,ferrior30/gitbook,justinleoye/gitbook,escopecz/documentation,athiruban/gitbook,vehar/gitbook,mruse/gitbook,megumiteam/documentation,guiquanz/gitbook,npracht/documentation,nycitt/gitbook,sunlianghua/gitbook,vehar/gitbook,guiquanz/gitbook,jasonslyvia/gitbook,intfrr/gitbook,grokcoder/gitbook,xcv58/gitbook,qingying5810/gitbook,FKV587/gitbook,ryanswanson/gitbook,tshoper/gitbook,gencer/gitbook,mautic/documentation,switchspan/gitbook,jasonslyvia/gitbook,rohan07/gitbook,mruse/gitbook,FKV587/gitbook,xxxhycl2010/gitbook,thelastmile/gitbook,sunlianghua/gitbook,wewelove/gitbook,justinleoye/gitbook,ZachLamb/gitbook,JohnTroony/gitbook,rohan07/gitbook,CN-Sean/gitbook,OriPekelman/gitbook,a-moses/gitbook,haamop/documentation,bradparks/gitbook