code: Fix clippy warnings

src/i18n.rs

@@ -31,7 +31,7 @@ fn freplace(input: String, args: &[&str]) -> String {
     let mut parts = input.split("{}");
     let mut output = parts.next().unwrap_or_default().to_string();
     for (p, a) in parts.zip(args.iter()) {
-        output += &(a.to_string() + &p.to_string());
+        output += &(a.to_string() + p);
     }
     output
 }