feat(langtool): restore langtool, using a local server

docs/emacs/packages/applications.org

@@ -1242,6 +1242,40 @@ minibuffer, both separated by a single space."
   ("q" nil :exit t))
 #+end_src
 
+** Langtool
+LanguageTool is a great tool for catching typos and grammatical errors
+in quite a few languages.
+#+begin_src emacs-lisp
+(use-package langtool
+  :defer t
+  :straight (:build t)
+  :commands (langtool-check
+             langtool-check-done
+             langtool-show-message-at-point
+             langtool-correct-buffer)
+  :custom
+  (langtool-default-language "en-US")
+  (langtool-mother-tongue "fr")
+  :config
+  (setq langtool-http-server-host "localhost"
+        langtool-http-server-port 8081))
+#+end_src
+
+Finally, =writegood-mode= detects some simple general rules when writing
+in English and can also calculate the Flesh-Kincaid levels of a
+document.
+#+begin_src emacs-lisp
+(use-package writegood-mode
+  :defer t
+  :straight (:build t)
+  :hook org-mode latex-mode
+  :general
+  (phundrak/major-leader-key
+    :keymaps 'writegood-mode-map
+    "g" #'writegood-grade-level
+    "r" #'writegood-reading-ease))
+#+end_src
+
 ** Nov
 Nov is a major-mode for reading EPUB files within Emacs. Since I have
 it, I don’t need any other Epub reader on my computer! Plus this one