adding new signatures fixing typos

activities/upcyclingandroid/sigtable.en.xml

@@ -150,7 +150,7 @@
     <td>Mailbox.org</td>
   </tr>
   <tr>
-    <td><a href="https://www.makeutopia.de/"><img src="openletter-logos/logo-make_utopia.png" alt=">make Utopia_"/></a></td>
+    <td><a href="https://www.makeutopia.de/"><img src="openletter-logos/logo-make-utopia.png" alt=">make Utopia_"/></a></td>
     <td>>make Utopia_</td>
   </tr>
   <tr>
@@ -162,7 +162,7 @@
     <td>NABU - Naturschutzbund Deutschland</td>
   </tr>
   <tr>
-    <td><a href="https://navcoin.org/"><img src="openletter-logos/logo-navcoin.jpg" alt="Navcoin"/></a></td>
+    <td><a href="https://navcoin.org/"><img src="openletter-logos/logo-navcoin.png" alt="Navcoin"/></a></td>
     <td>Navcoin</td>
   </tr>
   <tr>
@@ -226,6 +226,10 @@
     <td><a href="https://www.shiftphones.com/"><img src="openletter-logos/logo-shift.png" alt="Shift"/></a></td>
     <td>	Shift	</td>
   </tr>
+  <tr>
+    <td><a href="https://ubuntu-fr.org/"><img src="openletter-logos/logo-ubuntu-fr.png" alt="Unibinare"/></a></td>
+    <td>Ubuntu-fr</td>
+  </tr>
   <tr>
     <td><a href="https://unbina.re/"><img src="openletter-logos/logo-unbinare.png" alt="Unibinare"/></a></td>
     <td>Unbinare</td>