Add the possibility to visualize language instructions in visualize_dataset_html.py (#388)

Co-authored-by: Mishig <dmishig@gmail.com>

lerobot/templates/visualize_dataset_template.html

@@ -100,6 +100,13 @@
             {% endfor %}
         </div>
 
+        <!-- Language instruction -->
+        {% if videos_info[0].language_instruction %}
+        <p class="font-medium mt-2">
+            Language Instruction: <span class="italic">{{ videos_info[0].language_instruction }}</span>
+        </p>
+        {% endif %}
+
         <!-- Shortcuts info -->
         <div class="text-sm hidden md:block">
             Hotkeys: <span class="font-mono">Space</span> to pause/unpause, <span class="font-mono">Arrow Down</span> to go to next episode, <span class="font-mono">Arrow Up</span> to go to previous episode.