docs(ai): Use English for docstrings

configs/init-ai.el

@@ -163,16 +163,16 @@
   ;; activo en las sesiones gptel normales.
   (defun kj-gptel-magit--string-response-callback (callback)
     "Return a callback that forwards only string responses to CALLBACK.
-Descarta las celdas (reasoning . TEXTO) con las que gptel entrega el
-contenido de thinking al callback (ver `gptel-request')."
+Discards the (reasoning . TEXT) cells through which gptel delivers the
+thinking content to the callback (see `gptel-request')."
     (lambda (response &rest args)
       (when (stringp response)
         (apply callback response args))))
 
   (defun kj-gptel-magit--sanitize-callback (orig-fn &rest args)
     "Around advice for `gptel-magit--request'.
-Envuelve el argumento :callback de ARGS para que las respuestas con
-contenido de reasoning no rompan gptel-magit."
+Wraps the :callback argument of ARGS so that responses with reasoning
+content do not break gptel-magit."
     (let ((pos (cl-position :callback args)))
       (when (and pos (functionp (nth (1+ pos) args)))
         (setf (nth (1+ pos) args)
@@ -223,8 +223,8 @@ if they exist."
 
   (defun kj-gptel--agent-buffer-setup ()
     "Load AGENTS.md rules when a gptel-agent session buffer is created.
-Dispara para sesiones nuevas (buffer *gptel-agent:*) y para sesiones
-restauradas desde un archivo guardado (gptel--preset de agente)."
+Fires for new sessions (buffer *gptel-agent:*) and for sessions
+restored from a saved file (gptel--preset of the agent)."
     (when (and (bound-and-true-p gptel-mode)
                (or (string-prefix-p "*gptel-agent" (buffer-name))
                    (and (boundp 'gptel--preset)
@@ -254,10 +254,10 @@ gptel-agent's header, rendered as (:eval (funcall DISPLAY))."
                          (throw 'found action))))))))))
 
   (defun kj-gptel-toggle-plan-agent (&optional _data)
-    "Alternar entre el agente por defecto (build) y el modo plan.
-Equivale a hacer clic en el botón del header: invoca la misma acción
-que gptel-agent usa para ese botón.  DATA se ignora (compatibilidad
-con `buttonize')."
+    "Toggle between the default agent (build) and plan mode.
+Equivalent to clicking the header button: it invokes the same action
+that gptel-agent uses for that button.  DATA is ignored (compatibility
+with `buttonize')."
     (interactive)
     (unless (bound-and-true-p gptel-mode)
       (user-error "No estás en una sesión gptel"))
@@ -371,7 +371,7 @@ Uses eglot and flymake; starts the language server if needed."
         default-directory))
 
   (defun kj-gptel--read-prompt (name)
-    "Read the opencode prompt file NAME (p. ej. \"title.txt\") from the agents dir."
+    "Read the opencode prompt file NAME (e.g. \"title.txt\") from the agents dir."
     (string-trim
      (with-temp-buffer
        (insert-file-contents