(1) On cawiki (wmf.13) I start a new translation from Russian to Catalan (https://ca.wikipedia.org/wiki/Special:ContentTranslation?page=%D0%94%D0%B5%D0%BD%D1%8C+%D0%B2%D1%8B%D0%B1%D0%BE%D1%80%D0%BE%D0%B2+%28%D1%84%D0%B8%D0%BB%D1%8C%D0%BC%29&from=ru&to=ca&targettitle=%D1%82%D0%B5%D1%81%D1%82+4)
(2) Translating French to Catalan film template also produce the same error, e.g.
https://ca.wikipedia.org/wiki/Special:ContentTranslation?page=Lancelot+du+Lac+%28film%29&from=fr&to=ca&targettitle=Test6
Clicking on the template (equivalent to Infobox film template) produces "[CX] Error in adapting template. missing data-mw" Console error. I checked several enwiki Infobox film templates - no Console errors were displayed.
(3) Another case - testwiki (wmf.26). Translating the article "Saison 2 de Miraculous, les aventures de Ladybug et Chat Noir" from French to Chinese. The article consists entirely of templates, so the translating those templates will produce the Console error: "[CX] Error in adapting template. missing data-mw" and also the misalignment of paragraphs: