Update to description and addition of donate and translate links

src/xfce4-screenshooter.appdata.xml.in

@@ -14,8 +14,8 @@
     <_p>Allows you to capture the entire screen, the active window
         or a selected region. You can set the delay that elapses before the screenshot
         is taken and the action that will be done with the screenshot: save it to a PNG
-        file, copy it to the clipboard, open it using another application, or host it on
-        imgur, a free online image hosting service.
+        or JPG file, copy it to the clipboard, open it using another application, or host
+        it on imgur, a free online image hosting service.
     </_p>
   </description>
 
@@ -26,8 +26,10 @@
   </screenshots>
 
   <url type="homepage">https://docs.xfce.org/apps/screenshooter/start</url>
-  <url type="bugtracker">https://bugzilla.xfce.org/describecomponents.cgi?product=Xfce4-screenshooter</url>
+  <url type="bugtracker">https://gitlab.xfce.org/apps/xfce4-screenshooter</url>
   <url type="help">https://docs.xfce.org/apps/screenshooter/start</url>
+  <url type="donation">https://docs.xfce.org/contribute/start#donations</url>
+  <url type="translate">https://www.transifex.com/xfce/xfce-apps/xfce4-screenshooter/</url>
 
   <provides>
     <binary>xfce4-screenshooter</binary>