appdata: translate=no properties

It appears that the appstream project no longer supports
`translatable=no` properties, and gettext extract them as translatable.

I opened an issue to inform about the situation, but `translatable=no`
properties are not accepted by developers. You can find the issue
here: `https://github.com/ximion/appstream/issues/623`

**Please test your script or string extraction process before merging this PR.**

> In MetaInfo files, each individual paragraph of a description
> (or enumerated entry) is translated individually, however,
> you can only exclude the complete block from being translated
> by adding `translate="no"` to the description element.

Source: https://freedesktop.org/software/appstream/docs/sect-Quickstart-Translation.html

data/io.github.alexkdeveloper.predictor.metainfo.xml.in

@@ -34,21 +34,21 @@
   <content_rating type="oars-1.1"/>
   <releases>
     <release version="1.0.2" date="2024-03-29">
-    <description translatable="no">
+    <description translate="no">
       <ul>
         <li>Added Dutch translation</li>
       </ul>
     </description>
     </release>
     <release version="1.0.1" date="2024-03-27">
-    <description translatable="no">
+    <description translate="no">
       <ul>
         <li>Added Brazilian Portuguese translation</li>
       </ul>
     </description>
     </release>
     <release version="1.0.0" date="2024-03-20">
-    <description translatable="no">
+    <description translate="no">
       <ul>
         <li>Initial release</li>
       </ul>