[enh] enhance translation replacing self.tr() by QCoreApplication.translate()

src/sakia/gui/dialogs/connection_cfg/controller.py

src/sakia/gui/dialogs/connection_cfg/view.py

src/sakia/gui/dialogs/plugins_manager/controller.py

src/sakia/gui/dialogs/plugins_manager/view.py

src/sakia/gui/dialogs/revocation/view.py

src/sakia/gui/main_window/controller.py

src/sakia/gui/main_window/status_bar/controller.py

src/sakia/gui/main_window/toolbar/controller.py

src/sakia/gui/main_window/toolbar/view.py

src/sakia/gui/navigation/controller.py

src/sakia/gui/navigation/identities/view.py

src/sakia/gui/navigation/identity/controller.py

src/sakia/gui/navigation/identity/model.py

src/sakia/gui/navigation/model.py

src/sakia/gui/navigation/network/controller.py

src/sakia/gui/navigation/txhistory/controller.py

src/sakia/gui/navigation/txhistory/model.py

src/sakia/gui/navigation/txhistory/table_model.py

src/sakia/gui/navigation/txhistory/view.py

src/sakia/gui/sub/certification/controller.py