feat: add Ukrainian translation (#1065)

## Summary

* **What is the goal of this PR?**
A Ukrainian translation for the GUI

* **What changes are included?**
Everything according to
https://github.com/crosspoint-reader/crosspoint-reader/blob/master/docs/i18n.md

## Additional Context

* Add any other information that might be helpful for the reviewer
(e.g., performance implications, potential risks,
  specific areas to focus on).

Nope

---

### AI Usage

While CrossPoint doesn't have restrictions on AI tools in contributing,
please be transparent about their usage as it
helps set the right context for reviewers.

Did you use AI tools to help write this code? _**< PARTIALLY >**_ as a
consistency validation

docs/i18n.md

@@ -12,6 +12,7 @@ This guide explains the multi-language support system in CrossPoint Reader.
 - Swedish
 - Czech
 - Russian
+- Ukrainian
 
 ---
 

docs/translators.md

@@ -39,4 +39,7 @@ If you'd like to add your name to this list, please open a PR adding yourself an
 - [ariel-lindemann](https://github.com/ariel-lindemann)
 
 ## Catalan
-- [angeldenom](https://github.com/angeldenom)
+- [angeldenom](https://github.com/angeldenom)
+
+## Ukrainian
+- [mirus-ua](https://github.com/mirus-ua)