add czech language support and translation

pokerth_game.pro

@@ -258,6 +258,7 @@ SOURCES += src/pokerth.cpp \
     src/gui/qt/settingsdialog/mystylelistitem.cpp \
     src/gui/qt/gamelobbydialog/mygamelistsortfilterproxymodel.cpp
 TRANSLATIONS = ts/pokerth_bg.ts \
+    ts/pokerth_cz.ts \
     ts/pokerth_de.ts \
     ts/pokerth_dk.ts \
     ts/pokerth_es.ts \

src/gui/qt/settingsdialog/settingsdialogimpl.cpp

@@ -50,6 +50,7 @@ settingsDialogImpl::settingsDialogImpl(QWidget *parent, ConfigFile *c, selectAva
 
 	comboBox_switchLanguage->addItem(tr("Bulgarian"),"bg");
 	comboBox_switchLanguage->addItem(tr("Chinese"),"zhcn");
+	comboBox_switchLanguage->addItem(tr("Czech"),"cz");
 	comboBox_switchLanguage->addItem(tr("Danish"),"dk");
 	comboBox_switchLanguage->addItem(tr("Dutch"),"nl");
 	comboBox_switchLanguage->addItem(tr("English"),"en");