refactor: Fix unreachable code in init arg checks

Building with -Wunreachable-code-loop-increment causes a warning
due to always returning on the first iteration of the loop that
outputs errors on invalid args.

Collect all errors, and output them in a single error message
after the loop completes, resolving the warning and avoiding
popup hell by outputting a seperate message for each error.

src/util/translation.h

@@ -23,6 +23,11 @@ struct bilingual_str {
         translated += rhs.translated;
         return *this;
     }
+
+    bool empty() const
+    {
+        return original.empty();
+    }
 };
 
 inline bilingual_str operator+(bilingual_str lhs, const bilingual_str& rhs)