Convert LATIN LETTER L WITH STROKE to LATIN L

Because polish letter "ł" is not accented letter but separate character `normalize("NFD")` doesn't work so we need another approach.

See also:
 - https://www.fileformat.info/info/unicode/char/0142/index.htm
 - https://www.fileformat.info/info/unicode/char/0141/index.htm

src/core/operations/RemoveDiacritics.mjs

@@ -33,7 +33,9 @@ class RemoveDiacritics extends Operation {
      */
     run(input, args) {
         // reference: https://stackoverflow.com/questions/990904/remove-accents-diacritics-in-a-string-in-javascript/37511463
-        return input.normalize("NFD").replace(/[\u0300-\u036f]/g, "");
+        return input.normalize("NFD")
+            .replace(/\u0142/g, "l").replace(/\u0141/g, "L")
+            .replace(/[\u0300-\u036f]/g, "");
     }
 
 }

tests/operations/tests/Unicode.mjs

@@ -80,4 +80,15 @@ TestRegister.addTests([
             },
         ],
     },
+    {
+        name: "Remove Diacritics: polish letter ł",
+        input: "zażółć gęślą jaźń ZAŻÓŁĆ GĘŚLĄ JAŹŃ",
+        expectedOutput: "zazolc gesla jazn ZAZOLC GESLA JAZN",
+        recipeConfig: [
+            {
+                "op": "Remove Diacritics",
+                "args": []
+            },
+        ],
+    },
 ]);