Overrule the language of citation style
It is possible to change the language for the citations/bibliography independent of the language which is used in the zotero client. However, this seems only to work for citation styles which have not a specific language (default-locale) defined in the root element, which all styles corresponding to a specific journal have. Is it possible to always use the configurated settings from the about:config and therefore to overrule the style-specific settings? I would like to use a style for an English journal in German, without losing possible updates for the original English style. Is that possible?
"the default-locale attribute [in dependent styles] may be set to specify an overriding style locale."
edit: I vaguely remember some problems with that in practice, so let us know if it doesn't work correctly, but you should make any changes to official styles assuming that it does.