Inkcut currently support English and French languages. You can easily translate it.
To generate language 'ts' file, you need to run this lupdate-qt5 command replacing fr_FR by the language you want to add.
lupdate-qt5 inkcut/*/*.enaml -I inkcut/*/*/*.enaml -ts inkcut/res/translations/fr_FR.ts
The generated ts file can be translated using Qt5 linguistic application
Before release a new version, or in order to test your translation you need to execute the following command :
lrelease-qt5 inkcut/res/translations/*.ts
This will generate the necessary qm file that will be used by Inkcut