diff --git a/src/server/response.cpp b/src/server/response.cpp
index bc8c85e5..5399cfc5 100644
--- a/src/server/response.cpp
+++ b/src/server/response.cpp
@@ -239,8 +239,7 @@ HTTPErrorResponse& HTTP400Response::operator+(InvalidUrlMsg /*unused*/)
   if (!query.empty()) {
     requestUrl += "?" + encodeDiples(query);
   }
-  kainjow::mustache::mustache msgTmpl(R"(The requested URL "{{{url}}}" is not a valid request.)");
-  return *this + msgTmpl.render({"url", requestUrl});
+  return *this + ParameterizedMessage("invalid-request", {{"url", requestUrl}});
 }
 
 HTTP500Response::HTTP500Response(const InternalServer& server,
diff --git a/static/skin/i18n/en.json b/static/skin/i18n/en.json
index aaea0497..97a71d55 100644
--- a/static/skin/i18n/en.json
+++ b/static/skin/i18n/en.json
@@ -12,6 +12,7 @@
 	, "suggest-search" : "Make a full text search for <a href=\"{{{SEARCH_URL}}}\">{{PATTERN}}</a>"
 	, "random-article-failure" :  "Oops! Failed to pick a random article :("
 	, "invalid-raw-data-type" : "{{DATATYPE}} is not a valid request for raw content."
+	, "invalid-request" : "The requested URL \"{{{url}}}\" is not a valid request."
 	, "no-value-for-arg": "No value provided for argument {{ARGUMENT}}"
 	, "no-query" : "No query provided."
 	, "raw-entry-not-found" : "Cannot find {{DATATYPE}} entry {{ENTRY}}"
diff --git a/static/skin/i18n/qqq.json b/static/skin/i18n/qqq.json
index 18c97a60..d647a75e 100644
--- a/static/skin/i18n/qqq.json
+++ b/static/skin/i18n/qqq.json
@@ -15,6 +15,7 @@
 	"suggest-search": "Suggest a search when the URL points to a non existing article",
 	"random-article-failure": "Failure of the random article selection procedure",
 	"invalid-raw-data-type": "Invalid DATATYPE was used with the /raw endpoint (/raw/<book>/DATATYPE/...); allowed values are 'meta' and 'content'",
+	"invalid-request" : "Error text for malformed URLs.",
 	"no-value-for-arg": "Error text when no value has been provided for ARGUMENT in the request's query string",
 	"no-query": "Error text when no query has been provided for fulltext search",
 	"raw-entry-not-found": "Entry requested via the /raw endpoint was not found",
diff --git a/static/skin/i18n/test.json b/static/skin/i18n/test.json
index 7686471a..29def8ea 100644
--- a/static/skin/i18n/test.json
+++ b/static/skin/i18n/test.json
@@ -40,4 +40,6 @@
 	, "download-links-heading": "[I18N] Download links for <b><i>{{BOOK_TITLE}}</i></b> [TESTING]"
 	, "download-links-title": "[I18N TESTING]Download book"
 	, "preview-book": "[I18N] Preview [TESTING]"
+	, "no-query" : "[I18N TESTING] Kiwix can read your thoughts but it is against GDPR. Please provide your query explicitly."
+	, "invalid-request" : "[I18N TESTING] Invalid URL: \"{{{url}}}\""
 }
diff --git a/test/server.cpp b/test/server.cpp
index 73ba7b1f..86171cd4 100644
--- a/test/server.cpp
+++ b/test/server.cpp
@@ -927,6 +927,19 @@ TEST_F(ServerTest, Http400HtmlError)
       Too many books requested (4) where limit is 3
     </p>
 )"  },
+
+    // Testing of translation
+    { /* url */ "/ROOT%23%3F/search?content=zimfile&userlang=test",
+      expected_page_title=="[I18N TESTING] Invalid request ($400 fine must be paid)" &&
+      expected_body==R"(
+    <h1>[I18N TESTING] -400 karma for an invalid request</h1>
+    <p>
+      [I18N TESTING] Invalid URL: "/ROOT%23%3F/search?content=zimfile&userlang=test"
+    </p>
+    <p>
+      [I18N TESTING] Kiwix can read your thoughts but it is against GDPR. Please provide your query explicitly.
+    </p>
+)"  },
   };
 
   for ( const auto& t : testData ) {