Split out command and category descs

Move them to a more appropriate ns that is just dictionary focused.
This _majorly_ slims down dependencies for the main translation ns
Also:
- add tests
- make medley requires consistent
- alter spec to reflect how command data is actually being used in
  command palette component
- add basic translation tests

src/main/frontend/spec.cljs

@@ -15,7 +15,7 @@
   (when config/dev?
     (if (s/explain-data spec value)
      (let [error-message (expound/expound-str spec value)
-           ex (ex-info "Error in validate" {})]
+           ex (ex-info "Error in validate" {:value value})]
        (log/error :exception ex :spec/validate-failed error-message)
        false)
      true)))