Add Japanese Channel logo (channeltalk-logo-jp.svg) and update base template

templates/base.html

@@ -798,7 +798,7 @@
             <div class="supported-by">
                 <span>supported by</span>
                 <a href="https://channel.io/ja" target="_blank" rel="noopener noreferrer" class="channel-link">
-                    <img src="{{ url_for('static', filename='channeltalk-logo-kr.svg') }}" alt="Channel" class="channel-logo-img">
+                    <img src="{{ url_for('static', filename='channeltalk-logo-jp.svg') }}" alt="Channel" class="channel-logo-img">
                 </a>
             </div>  
         </div>