1. A method comprising: instantiating a virtual service from a service model, wherein the virtual service is operable to receive requests intended for a particular one of a plurality of software components in a system and generate simulated responses of the particular software component based on a service model modeling responses of the particular software component; identifying a particular request from another software component intended for the particular software component, wherein the particular request is redirected to the virtual service; generating content of a simulated response to the particular request using the virtual service, wherein the content of the simulated response is in a first language; determining, based on the request, a second language to be applied to the simulated response; determining, using a data processing apparatus, a translation of the content from the first language into the second language; and sending a modified version of the simulated response comprising the content in the second language to the other software component in response to the particular request.