feat(i18n): update Czech translations [skip ci]

Currently translated at 44.6% (109 of 244 strings)

Co-authored-by: Gdany <gdanyxor@gmail.com>
Translate-URL: https://hosted.weblate.org/projects/discord-tickets/bot/cs/
Translation: Discord Tickets/Bot

src/i18n/cs.yml

@@ -138,6 +138,14 @@ commands:
         tag:
           description: Jméno tagu pro použití
           name: tag
+    tickets:
+      name: tickety
+      response:
+        fields:
+          closed:
+            name: Uzavřené tickety
+          open:
+            name: Otevřít tickety
 buttons:
   accept_close_request:
     emoji: ✅