add ""_tr literal to translate string by PITranslator add pip_tr util, now useless, only can generate *.ts add qt_support internal lib, now only works with *.ts file pip_vtt migrate to qt_support
add ""_tr literal to translate string by PITranslator add pip_tr util, now useless, only can generate *.ts add qt_support internal lib, now only works with *.ts file pip_vtt migrate to qt_support