Remove all compilation errors

src/sakia/app.py

src/sakia/constants.py

src/sakia/core/__init__.py

src/sakia/core/account.py

src/sakia/core/registry/__init__.py

src/sakia/core/registry/identities.py

src/sakia/core/registry/identity.py

src/sakia/data/connectors/node.py

src/sakia/data/entities/certification.py

src/sakia/data/graphs/base_graph.py

src/sakia/data/processors/certifications.py

src/sakia/data/processors/identities.py

src/sakia/data/repositories/certifications.py

src/sakia/data/repositories/identities.py

src/sakia/gui/contact.py

src/sakia/gui/contact.ui

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

src/sakia/gui/dialogs/certification/model.py

src/sakia/gui/dialogs/community_cfg/model.py

src/sakia/gui/navigation/controller.py