KDE Gettext-based UI text internationalization
KI18n provides functionality for internationalizing user interface text in applications, based on the GNU Gettext translation system. It wraps the standard Gettext functionality, so that the programmers and translators can use the familiar Gettext tools and workflows.
KI18n provides additional functionality as well, for both programmers and translators, which can help to achieve a higher overall quality of source and translated text. This includes argument capturing, customizable markup, and translation scripting.
If you are using CMake, you need to have
find_package(KF5I18n NO_MODULE) ki18n_install(po)
(or similar) in your CMakeLists.txt file, and you need to link to KF5::I18n.