In my library many references have been downloaded from PubMed or other providers, and therefore the capitalization in the titles corresponds to that of the original database from which the data have been downloaded. Most of the journals wher I publish generally use sentence style capitalization for their references list. I know that this can be achieved by selecting “Sentence style capitalization” under “Bibliography” -> “Title capitalization” in the output style editor. This leads to acceptable results in the majority of cases when the language of the title is English, but I often cite references whose titles are in other languages, e.g., in German where nouns always start with a capital letter and something like headline capitalization does not exist. In these cases, choosing “Sentence style capitalization” leads to incorrect output.
Is there a way of restricting sentence or headline style capitalization to English-language references only?