We (Sigil) have no control over the choice of languages and their region specific variations on Transifex.
When both exist, we choose the one with the most complete translation (that meets the minimum of 70% - 75% of the translation complete). If both exist and are duplicates (or nearly so) we use the broader language only (no region) version.
That said, once we get the Transifex .ts files into Sigil, we could in theory adjust them to be just language only (ie take "uk_UA" and make it "uk") before making our release builds.
Would that help?
KevinH
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