On Tue, 14 Oct 2014 14:06:59 +0200
Ulrike Fischer
You first has to decide "do I want title_variant_a always, or only if the main language of the document is english, or only if an option is set or only if ...". What should happen if the language of the document is in japanese, the bib-entry is a french book and there is a translated_chinese variant of the title?
According to the APA style guide: "If the original version of a non-English article is used as the source, cite the original version. Give the original title and, in brackets, the English translation." "If an English translation of a non-English article is used as the source, cite the English translation. Give the English title without brackets." Other styles might specify differently. Hans and I are working (furiously) on the new mkiv bibliography subsystem. We have been discussing language (with Thomas as well). The title= will be typeset (and hyphenated) according to the language= field, if present; The rest of the bibliography list ("and", for example) will be typeset using the document language. A global bibliography rendering option can modify this choice. Alan