UI: Set donation, bugtracker, and translate AppData fields

These are more fields that app stores such as GNOME Software
and Discover show. Nothing fancy, but the more information we
provide, the better it looks!

UI/xdg-data/com.obsproject.Studio.appdata.xml.in

@@ -11,6 +11,9 @@
     <p>Free and open source software for video capturing, recording, and live streaming.</p>
   </description>
   <url type="homepage">https://obsproject.com</url>
+  <url type="bugtracker">https://github.org/obsproject/obs-studio/issues</url>
+  <url type="donation">https://obsproject.com/contribute</url>
+  <url type="translate">https://crowdin.com/project/obs-studio</url>
   <screenshots>
     <screenshot type="default">
       <image>https://obsproject.com/assets/images/OBSDemoApp.jpg</image>