Localized "No such book" 404 message for /random

However the title and the heading of the 404 page are not localized yet.

src/server/internalServer.cpp

@@ -452,9 +452,9 @@ std::string makeFulltextSearchSuggestion(const std::string& lang, const std::str
          );
 }
 
-std::string noSuchBookErrorMsg(const std::string& bookName)
+ParameterizedMessage noSuchBookErrorMsg(const std::string& bookName)
 {
-  return "No such book: " + bookName;
+  return ParameterizedMessage("no-such-book", { {"BOOK_NAME", bookName} });
 }
 
 std::string noSearchResultsMsg()

static/i18n/en.json

@@ -5,5 +5,6 @@
 	},
 	"name":"English",
 	"suggest-full-text-search": "containing '{{{SEARCH_TERMS}}}'..."
+	, "no-such-book": "No such book: {{BOOK_NAME}}"
 	, "url-not-found" : "The requested URL \"{{url}}\" was not found on this server."
 }

static/i18n/hy.json

@@ -5,5 +5,6 @@
 	},
 	"name":"Հայերեն",
 	"suggest-full-text-search": "որոնել '{{{SEARCH_TERMS}}}'..."
+	, "no-such-book": "Գիրքը բացակայում է՝ {{BOOK_NAME}}"
 	, "url-not-found" : "Սխալ հասցե՝ {{url}}"
 }

static/i18n/qqq.json

@@ -6,5 +6,6 @@
 	},
 	"name": "Current language to which the string is being translated to.",
 	"suggest-full-text-search": "Text appearing in the suggestion list that, when selected, runs a full text search instead of the title search"
+	, "no-such-book": "Error text when the requested book is not found in the library"
 	, "url-not-found" : "Error text about wrong URL for an HTTP 404 error"
 }

test/server.cpp

@@ -571,6 +571,14 @@ TEST_F(ServerTest, 404WithBodyTesting)
     </p>
 )"  },
 
+    { /* url */ "/ROOT/random?content=non-existent-book&userlang=hy",
+      expected_body==R"(
+    <h1>Not Found</h1>
+    <p>
+      Գիրքը բացակայում է՝ non-existent-book
+    </p>
+)"  },
+
     { /* url */ "/ROOT/suggest?content=no-such-book&term=whatever",
       expected_body==R"(
     <h1>Not Found</h1>