feat: frontend autocomplete is diacritics/ligatures insensitive (#6169)

Co-authored-by: Pierre <pierre@debian.zabi.ovh>
Co-authored-by: Michael Genson <genson.michael@gmail.com>
Co-authored-by: Michael Genson <71845777+michael-genson@users.noreply.github.com>

frontend/composables/use-utils.test.ts

@@ -0,0 +1,34 @@
+import { describe, expect, test } from "vitest";
+import { normalize, normalizeFilter } from "./use-utils";
+
+describe("test normalize", () => {
+  test("base case", () => {
+    expect(normalize("banana")).not.toEqual(normalize("Potatoes"));
+  });
+  test("diacritics", () => {
+    expect(normalize("Rátàtôuile")).toEqual("ratatouile");
+  });
+  test("ligatures", () => {
+    expect(normalize("IJ")).toEqual("ij");
+    expect(normalize("æ")).toEqual("ae");
+    expect(normalize("œ")).toEqual("oe");
+    expect(normalize("ff")).toEqual("ff");
+    expect(normalize("fi")).toEqual("fi");
+    expect(normalize("st")).toEqual("st");
+  });
+});
+
+describe("test normalize filter", () => {
+  test("base case", () => {
+    const patternA = "Escargots persillés";
+    const patternB = "persillés";
+
+    expect(normalizeFilter(patternA, patternB)).toBeTruthy();
+    expect(normalizeFilter(patternB, patternA)).toBeFalsy();
+  });
+  test("normalize", () => {
+    const value = "Cœur de bœuf";
+    const query = "coeur";
+    expect(normalizeFilter(value, query)).toBeTruthy();
+  });
+});