Speed up entries endpoint or provide a lightweight alternative

[mvahowe]

Right now some of the entries endpoints take tens of seconds to complete on api-demo. DBL.Local is going to need this in order to provide an interface to select entries. That interface doesn't need all the gory details of the entries so, if that detail is expensive, we could use a cheaper alternative that just provides a small subset of the available information (eg id, abbreviation, name, language, or something).