doap info: Update programming-language to C++ (#1048)

Author: largestgithubuseronearth

Parabolic.doap

@@ -10,7 +10,7 @@
   <bug-database rdf:resource="https://github.com/NickvisionApps/Parabolic/issues"/>
   <download-page rdf:resource="https://flathub.org/apps/details/org.nickvision.tubeconverter" />
   <category rdf:resource="http://api.gnome.org/doap-extensions#apps" />
-  <programming-language>C#</programming-language>
+  <programming-language>C++</programming-language>
 
   <maintainer>
     <foaf:Person>