These translations are directly from the translation files for Qt.
The files are here:
Quote:
C:\Program Files\Sigil\translations\qtbase_XX.qm
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If there is no translation for Ukrainian then it is not added to the Sigil installer by default.
If there is an official qtbase_ua.qm file (which is created from the qtbase_ua.ts file – also translated by Transifex) then it will be automatically added in the preparation process at the next Sigil release.