tests: add req.acceptsLanguage tests
tests: add req.acceptsLanguage tests

ci-test2/express,nodejs-camp/booklog-ansaga,bjrmatos/express,featurist/express,Kevnz/express,nodejs-camp/booklog-linkchen,nbeydoon/express,abhi3/express,nathan818fr/express,jinghuizhai/express,blainsmith/express,pathirana/express,hdngr/express,coreypnorris/express,gretac/express,ZackBotkin/express,nodejs-camp/booklog-archer,abhi3/express,nodejs-camp/booklog-archer,christopheranderson/express,kylezhang/express,drzorm/express,ahdinosaur/express,michaeljunlove/express,hanweifish/express,dotnetCarpenter/express,strongloop/express,qq645381995/express,nodejs-camp/booklog-ansaga,emvici/emvici-reqres-tify,nodejs-camp/booklog-tonebeta-update,BaggersIO/express,evanlucas/express,nodejs-camp/booklog-homa,nodejs-camp/booklog-chenyou,simplyianm/express,microlv/express,corporateanon/express,jenia0jenia/express,Kevnz/express,HXYNODE/express,YR/express,ZackBotkin/express,nodejs-camp/booklog-linkchen,dafabulousteach/express,Faiz7412/express,lmtdit/express,r14r-work/fork_express_master,dafabulousteach/express,xtidt/express,WebStyle/express,Jonekee/express,topaxi/express,expressjs/express,vnglst/express,supasate/express,qq645381995/express,lian774739140/express,fanzetao/express,chuym/express,aifeld/express,wesleytodd/express,saisai/express,maraoz/express,michaeljunlove/express,andriyl/express,VegeChou/express,Riokai/express,yinhe007/express,qitianchan/express,jymsy/express,kunalpict/express,luxe-eng/valet-express.express,nodejs-camp/booklog-s890506,Ju2ender/express,1verson/express,RanadeepPolavarapu/express,smcmurray/express,Ju2ender/express,HXYNODE/express,benshiue/booklog-ben,LestaD/express,luxe-eng/valet-express.express,jinghuizhai/express,hacksparrow/express,za-creature/express,blainsmith/express,swarajgiri/express,stevemao/express,pathirana/express,fineday32/express,heicx/express,nodejs-camp/booklog-mora,hpcslag/express,vinodhalaharvi/express,MoraLin/mora-test,qitianchan/express,Lexine/express,tianhengzhou/express,junxiong/express,youprofit/express,coreypnorris/express,swarajgiri/express,KodkodGates/express,weilixia/express,listepo/express,fakedarren/express,grigorkh/express,swstack/express,evilboss/express,svnh/express,michaeljunlove/express,svnh/express,shanawarkhan/express,Matrixbirds/express,hacksparrow/express,qq645381995/express,dongooo/express,hanqingnan/express,vnglst/express,simudream/express,leiqiang75/express,maraoz/express,RickyDan/express,auth0/express,mcanthony/express,nodejs-camp/booklog-tonebeta-update,Flip120/express,buildsample/express,PUSEN/express,rupanjanbaidya/express,nodejs-camp/booklog-Zak,dreamingblackcat/express,neomadara/express,hightechweb/express,flomotlik/express,caiocutrim/express,kubrickology/express,vinodhalaharvi/express,JulyZhu/express,gnowoel/express,adjohnson916/express,hl198181/express,leiqiang75/express,pstrike/express,tianhengzhou/express,pshomov/express,1amageek/express,FernAbby/express,KodkodGates/express,kylezhang/express,srichatala/express,abdulhannanali/express,angelsanz/express,supasate/express,vnglst/express,jenalgit/express,bercanozcan/express,blairzhang/express,expressjs/express,dongooo/express,vidyar/express,udhayam/express,aifeld/express,Riokai/express,Matrixbirds/express,dongseop/express,stewartml/express,za-creature/express,sarvex/express,sarvex/express,youprofit/express,juandav/express,Jonekee/express,drzorm/express,danielrohers/express,MoraLin/mora-test,juanpastas/express,grigorkh/express,dsupera13/express,sarvex/express,nodejs-camp/booklog-leo,demohi/express,RanadeepPolavarapu/express,gretac/express,sujianping/express,jenia0jenia/express,dafabulousteach/express,Eric-Vandenberg/express,nodejs-camp/booklog-s890506,baldurh/express,heicx/express,nodejs-camp/booklog-jason,ci-test2/express,v10258/express,chrisinajar/express,friederbluemle/express,svnh/express,robomc/express,lemelon/express,rupanjanbaidya/express,Lexine/express,dreamingblackcat/express,bercanozcan/express,samuelcastro/express,featurist/express,mikewesthad/express,nodejs-camp/booklog-chle,codeforgeek/express,nodejs-camp/booklog-chle,kylezhang/express,nodejs-camp/booklog-ausir,tjmehta/express,dgofman/express,samuelcastro/express,junxiong/express,mimaidms/express,grigorkh/express,Haru1990/express,stewartml/express,bercanozcan/express,blakeembrey/express,dieuly/express,nbeydoon/express,v10258/express,Eric-Vandenberg/express,KodkodGates/express,PeterWangPo/express,christopheranderson/express,nbeydoon/express,xiaofuzi/express,swarajgiri/express,simudream/express,hanqingnan/express,yinhe007/express,tjmehta/express,xtidt/express,TestingCI/express,adjohnson916/express,WangCao/express,srichatala/express,abdulhannanali/express,strongloop/express,Flip120/express,nodejs-camp/booklog-ben,TestingCI/express,vidyar/express,nodejs-camp/booklog-polo,pshomov/express,micha149/express,stevemao/express,kubrickology/express,LestaD/express,chuym/express,simplyianm/express,cflynn07/express,fuse-mars/express,1amageek/express,vinodhalaharvi/express,mcanthony/express,featurist/express,Talkyunyun/express,dotnetCarpenter/express,ralic/express,lian774739140/express,blakeembrey/express,dongseop/express,JulyZhu/express,BaggersIO/express,Faiz7412/express,listepo/express,kunalpict/express,gnowoel/express,fakedarren/express,demohi/express,r14r/fork_express_master,angelsanz/express,fanzetao/express,jimmykuo/express,gnowoel/express,juandav/express,nodejs-camp/booklog-homa,topaxi/express,ahdinosaur/express,hpcslag/express,CrazySherman/express,abhi3/express,microlv/express,swstack/express,FernAbby/express,ericlu88/express,methuz/express,ifraixedes/express,XueQian/express,nodejs-camp/booklog-mora,LestaD/express,andriyl/express,saisai/express,llwanghong/express,juanpastas/express,Eric-Vandenberg/express,r14r/fork_express_master,listepo/express,luxe-eng/valet-express.express,devgeniem/express,WangCao/express,friederbluemle/express,stoskov/express,countdracular/express,evanlucas/express,xiaofuzi/express,vidyar/express,benshiue/booklog-ben,PeterWangPo/express,jenalgit/express,Haru1990/express,elkingtonmcb/express,corporateanon/express,dsupera13/express,qitianchan/express,maraoz/express,ci-test2/express,nodejs-camp/booklog-leo,robomc/express,ralic/express,stevemao/express,buildsample/express,chrisinajar/express,jymsy/express,jenalgit/express,awronka/express,evilboss/express,nathan818fr/express,corporateanon/express,VegeChou/express,dreamingblackcat/express,lmtdit/express,Talkyunyun/express,junxiong/express,fuse-mars/express,wtony/express,nodejs-camp/booklog-jason,hl198181/express,flomotlik/express,stoskov/express,nodejs-camp/booklog-polo,ZackBotkin/express,fakedarren/express,pstrike/express,weilixia/express,igarciaes/express,YR/express,nodejs-camp/booklog-tonebeta,abdulhannanali/express,hpcslag/express,WebStyle/express,ericlu88/express,wesleytodd/express,codeforgeek/express,jinghuizhai/express,Ju2ender/express,Ivanwangcy/express,lmtdit/express,hightechweb/express,PUSEN/express,devgeniem/express,fineday32/express,r14r-work/fork_express_master,hdngr/express,dieuly/express,TestingCI/express,thepont/express,stewartml/express,elkingtonmcb/express,nodejs-camp/booklog-Zak,nodejs-camp/booklog-ausir,friederbluemle/express,devgeniem/express,XueQian/express,igarciaes/express,danielrohers/express,angelsanz/express,mauricionr/express,smcmurray/express,WangCao/express,wtony/express,nodejs-camp/booklog-ben,sibura/express,nodejs-camp/booklog-jollen,awronka/express,kunalpict/express,simudream/express,coreypnorris/express,caiocutrim/express,hanweifish/express,udhayam/express,cflynn07/express,hdngr/express,Flip120/express,1amageek/express,blakeembrey/express,auth0/express,thepont/express,ifraixedes/express,tyler-johnson/express,baldurh/express,llwanghong/express,Ivanwangcy/express,stoskov/express,nodejs-camp/booklog-jollen,Riokai/express,bjrmatos/express,mikewesthad/express,dongseop/express,BaggersIO/express,evilboss/express,nodejs-camp/booklog-chenyou,topaxi/express,blairzhang/express,supasate/express,chrisinajar/express,jimmykuo/express,neomadara/express,micha149/express,nodejs-camp/booklog-polo,sujianping/express,wtony/express,XueQian/express,dotnetCarpenter/express,Faiz7412/express,lemelon/express,jenia0jenia/express,tyler-johnson/express,blairzhang/express,dgofman/express,methuz/express,nodejs-camp/booklog-tonebeta,mauricionr/express,countdracular/express,mimaidms/express,sibura/express,smcmurray/express,za-creature/express,youprofit/express,1verson/express,shanawarkhan/express,buildsample/express,CrazySherman/express,RickyDan/express,v10258/express,xiaofuzi/express