Add translation file checking (#2078)
Add translation file checking (#2078)

* Check translation file is exists

* use existsSync to check translation file exist

dmitriyse/angular2-seed,dmitriyse/angular2-seed,ysyun/angular-seed-stub-api-environment,fr-esco/angular-seed,christophersanson/js-demo-fe,jigarpt/angular-seed-semi,hookom/climbontheway,christophersanson/js-demo-fe,sanastasiadis/angular-seed-openlayers,vyakymenko/angular-seed-express,sanastasiadis/angular-seed-openlayers,mgechev/angular2-seed,ysyun/angular-seed-stub-api-environment,JohnnyQQQQ/angular-seed-material2,dmitriyse/angular2-seed,vyakymenko/angular-seed-express,jigarpt/angular-seed-semi,hookom/climbontheway,ysyun/angular-seed-stub-api-environment,pieczkus/whyblogfront,JohnnyQQQQ/angular-seed-material2,jigarpt/angular-seed-semi,mgechev/angular2-seed,mgechev/angular-seed,dmitriyse/angular2-seed,fr-esco/angular-seed,mgechev/angular-seed,pieczkus/whyblogfront,pieczkus/whyblogfront,sanastasiadis/angular-seed-openlayers,mgechev/angular-seed,hookom/climbontheway,JohnnyQQQQ/angular-seed-material2,ysyun/angular-seed-stub-api-environment,mgechev/angular2-seed,hookom/climbontheway,fr-esco/angular-seed,vyakymenko/angular-seed-express,christophersanson/js-demo-fe