Currently, an error preventing publishing is shown when the amount of unmodified content is 99% or higher (T190283). This was targeted to prevent the most clear cases of vandalism. Given that low-quality translations seem to proliferate in Indonesian Wikipedia (T219851) we want to adjust this threshold to be more strict.
On Indonesian Wikipedia (and only there), the threshold will be adjusted to prevent the publication of translations with an overall amount of >30% of unmodified contents.
Based on data and feedback we'll evaluate whether the adjusted threshold improves the situation significantly in conjunction with other adjustments proposed (T221359), or it needs further adjustment. We need to keep in mind the potential for false positives, since elements such as proper nouns, templates, short section titles, and references are often legitimate unmodified content that is ok for users to publish (so we may need to keep some 5-10% of margin of error).