Update app.py

app.py

@@ -48,7 +48,7 @@ def create_graph(text):
 def visualize_graph(graph):
     for key, value in plt.rcParams.items():
         print(f"{key}: {value}")
-    plt.rcParams['font.family'] = ['DejaVu Sans']
+    plt.rcParams['font.family'] = ['DejaVu Sans', 'IPAexGothic']
     plt.figure(figsize=(12, 8))
     pos = nx.spring_layout(graph._graph)
     nx.draw(graph._graph, pos, with_labels=True, node_color='lightblue', node_size=500, font_size=8, font_weight='bold')