add JA because may have a JA contributor

package.nw/GridTracker.html

@@ -1134,9 +1134,10 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
                     <td>
                       <select id="languageLocale" value="en" onchange="changeLocale();">
                         <option value="en">English</option>
-                        <option value="es">Español</option>
                         <option value="cn">中文</option>
                         <option value="de">Deutsch</option>
+                        <option value="es">Español</option>
+                        <option value="ja">日本語</option>
                       </select>
                     </td>
                   </tr>