Fixed a bug when no compiled translations are available.
Fixed a bug when no compiled translations are available.

dromanow/flaskbb,dromanow/flaskbb,SeanChen0617/flaskbb-1,SeanChen0617/flaskbb-1,zky001/flaskbb,SeanChen0617/flaskbb,realityone/flaskbb,realityone/flaskbb,emile2016/flaskbb,zky001/flaskbb,lucius-feng/flaskbb,China-jp/flaskbb,qitianchan/flaskbb,lucius-feng/flaskbb,emile2016/flaskbb,China-jp/flaskbb,China-jp/flaskbb,SeanChen0617/flaskbb,qitianchan/flaskbb,lucius-feng/flaskbb,qitianchan/flaskbb,dromanow/flaskbb,SeanChen0617/flaskbb,realityone/flaskbb,zky001/flaskbb,SeanChen0617/flaskbb-1,emile2016/flaskbb