Enhance: Add more translations, remove unused ones and add linter for unused (#8568)

* chore: remove unused dictionary keys

* wip: add dictionary keys for hardcoded strings

* resolve conflicts

* Add linter to detect :en ui translation keys match used ones

- Fix a couple entries caught by linter
- Copy :command.editor/open-link-in-sidebar entries to
  :help/open-link-in-sidebar as translation keys shouldn't be reused in
  multiple contexts, especially when it's across ui and shortcut dicts

* fix: remove dead keys

* chore: reuse dict keys

* chore: reintroduce useful keys

---------

Co-authored-by: Gabriel Horner <gabriel@logseq.com>

src/main/frontend/components/export.cljs

@@ -14,7 +14,7 @@
   []
   (when-let [current-repo (state/get-current-repo)]
     [:div.export
-     [:h1.title "Export"]
+     [:h1.title (t :export)]
      [:ul.mr-1
       [:li.mb-4
        [:a.font-medium {:on-click #(export/export-repo-as-edn-v2! current-repo)}