New translations strings.xml (Japanese)

mesh_service_example/src/main/res/values-ja-rJP/strings.xml

@@ -15,4 +15,7 @@
   ~ You should have received a copy of the GNU General Public License
   ~ along with this program.  If not, see <https://www.gnu.org/licenses/>.
   -->
-<resources></resources>
+<resources>
+    <string name="app_name">MeshServiceExample</string>
+    <string name="send_hello_message">Send Hello Message</string>
+</resources>