fix(avatar): Parse unicode characters in name for avatar component

Signed-off-by: Marek Šneberger <marek@sneberger.cz>

.changeset/rare-crabs-taste.md

@@ -0,0 +1,5 @@
+---
+'@backstage/core-components': patch
+---
+
+Parse unicode characters in name for avatar component

.github/vale/Vocab/Backstage/accept.txt

@@ -402,6 +402,7 @@ Uffizzi
 ui
 unbreak
 Unconference
+unicode
 unmanaged
 unregister
 unregistering

packages/core-components/src/components/Avatar/util.test.ts

@@ -27,6 +27,10 @@ describe('extractInitials', () => {
     expect(extractInitials('Jenny Doe')).toEqual('JD');
   });
 
+  it('extract unicode initials', async () => {
+    expect(extractInitials('Petr Čech')).toEqual('PČ');
+  });
+
   it('extract single letter for short name', async () => {
     expect(extractInitials('Doe')).toEqual('D');
   });

packages/core-components/src/components/Avatar/utils.ts

@@ -28,5 +28,8 @@ export function stringToColor(str: string) {
 }
 
 export function extractInitials(value: string) {
-  return value.match(/\b\w/g)?.join('').slice(0, 2);
+  return value
+    .match(/(?<!\p{L})\p{L}/gu)
+    ?.join('')
+    .slice(0, 2);
 }