Update button text in musikgame_answer template for clarity

Fix #6

game/templates/game/musikgame_answer.html

@@ -21,6 +21,6 @@
                 {% endfor %}
             </tbody>
         </table>
-        {% if not musikgame.over %}<button type="submit">Valider mes réponses</button>{% endif %}
+        {% if not musikgame.over %}<button type="submit">Sauvegarder mes réponses</button>{% endif %}
     </form>
 {% endblock content %}