appease clang 15 -Wunused-but-set-variable

Index: launcher/translations/TranslationsModel.cpp
--- launcher/translations/TranslationsModel.cpp.orig
+++ launcher/translations/TranslationsModel.cpp
@@ -190,7 +190,6 @@ void readIndex(const QString & path, QMap<QString, Lan
         return;
     }
 
-    int index = 1;
     try
     {
         auto toplevel_doc = Json::requireDocument(data);
@@ -223,7 +222,6 @@ void readIndex(const QString & path, QMap<QString, Lan
             lang.file_size = Json::requireInteger(langObj, "size");
 
             languages.insert(lang.key, lang);
-            index++;
         }
     }
     catch (Json::JsonException & e)
