data: Mark release descriptions as untranslatable

GNOME automatically excludes release descriptions on Damned Lies
(GNOME Translation Platform). It's a good practice to follow
the GNOME way.

This can streamline the translation process, allowing translators
to focus their efforts on more critical and user-facing aspects of
the application.

data/com.usebottles.bottles.metainfo.xml.in

@@ -65,18 +65,18 @@
   </requires>
   <releases>
     <release version="51.9" date="2023-08-21">
-      <description>
+      <description translatable="no">
         <p>Fix runners and components from not showing when prereleases are off</p>
         <p>Fix Steam runtime compatibility with Wine runners</p>
       </description>
     </release>
     <release version="51.8" date="2023-08-21">
-      <description>
+      <description translatable="no">
         <p>A few bug fixes</p>
       </description>
     </release>
     <release version="51.6" date="2023-05-03">
-      <description>
+      <description translatable="no">
         <p>Support for the double-DLL VKD3D</p>
         <p>Updated Flatpak runtime</p>
         <p>Minor improvement and fixes to the library</p>
@@ -86,34 +86,34 @@
       </description>
     </release>
     <release version="51.5" date="2023-02-23">
-      <description>
+      <description translatable="no">
         <p>Update metadata information</p>
       </description>
     </release>
     <release version="51.4" date="2023-02-23">
-      <description>
+      <description translatable="no">
         <p>Add more update information and correct release notes version</p>
       </description>
     </release>
     <release version="51.3" date="2023-02-23">
-      <description>
+      <description translatable="no">
         <p>Fixed "Add to Steam" button</p>
         <p>Fixed BottleConfig being not serializable</p>
         <p>Fixed Patool double extraction failing</p>
       </description>
     </release>
     <release version="51.2" date="2023-02-21">
-      <description>
+      <description translatable="no">
         <p>Correct version</p>
       </description>
     </release>
     <release version="51.1" date="2023-02-20">
-      <description>
+      <description translatable="no">
         <p>Fix crash when creating a bottle</p>
       </description>
     </release>
     <release version="51.0" date="2023-02-20">
-      <description>
+      <description translatable="no">
         <p>Major change: Redesign New Bottle interface</p>
         <p>Quality of life improvements:</p>
         <ul>
@@ -131,22 +131,22 @@
       </description>
     </release>
     <release version="50.2" date="2023-01-18">
-      <description>
+      <description translatable="no">
         <ul>
           <li>Fix error when downloading if Bottles isn't run from terminal</li>
         </ul>
       </description>
     </release>
     <release version="50.1" date="2023-01-15">
-      <description>
+      <description translatable="no">
         <ul>
           <li>Correct version date</li>
           <li>Hide NVIDIA-related critical errors on non-NVIDIA systems</li>
         </ul>
       </description>
     </release>
     <release version="50.0" date="2023-01-14">
-      <description>
+      <description translatable="no">
         <ul>
           <li>Gamescope improvements and fixes</li>
           <li>Dependency installation is faster and more stable</li>