Fix unused catch bindings

app/common/ValueCache.mjs

@@ -16,7 +16,7 @@ export default class ValueCache
       let data = await fs.readFile(this.path);
 
       return JSON.parse(data);
-    } catch (e) {
+    } catch {
       return null;
     }
   }

utility/copyTranslation.mjs

@@ -28,7 +28,7 @@ const locales = {
 async function readFile(file) {
   try {
     return JSON.parse(await fs.readFile(file));
-  } catch (e) {
+  } catch {
     return {};
   }
 }