[BUG] (Does not support Ukrainian language)

[Vertuhai]

Please confirm these before moving forward

• I have searched for my issue and have not found a work-in-progress/duplicate/resolved issue.
• I have tested that this issue has not been fixed in the latest (beta or stable) release.
• I have checked the FAQ section for solutions.
• This issue is about a bug (if it is not, please use the correct template).

UniGetUI Version

UniGetUI v2026.1.4 Portable

Windows version, edition, and architecture

Windows 10 x64

Describe your issue

When you select the Ukrainian language in the program, the program does not switch to Ukrainian but switches to English.
I checked selectively with other languages, it switches without problems, but it does not switch to Ukrainian.

Examples of switching to other languages.

Steps to reproduce the issue

No response

UniGetUI Log

no

Package Managers Logs

no

Relevant information

No response

Screenshots and videos

No response

[mamoreau-devolutions]

I can reproduce the issue, I can see this corresponding error in the logs:

[2026-04-08 8:44:15 AM] LoadLanguageFile Failed for LangKey=ua
[2026-04-08 8:44:15 AM] System.ArgumentException: An item with the same key has already been added. Key: Android Subsystem (Parameter 'key')
                           at System.Collections.ThrowHelper.ThrowDuplicateKey[TKey](TKey key)
                           at System.Collections.Generic.OrderedDictionary`2.TryInsert(Int32 index, TKey key, TValue value, InsertionBehavior behavior, Int32& keyIndex)
                           at System.Collections.Generic.OrderedDictionary`2.Add(TKey key, TValue value)
                           at System.Text.Json.Nodes.JsonObject.InitializeDictionary()
                           at System.Text.Json.Nodes.JsonObject.get_Count()
                           at System.Linq.Enumerable.TryGetNonEnumeratedCount[TSource](IEnumerable`1 source, Int32& count)
                           at System.Linq.Enumerable.ToDictionary[TSource,TKey,TElement](IEnumerable`1 source, Func`2 keySelector, Func`2 elementSelector, IEqualityComparer`1 comparer)
                           at System.Linq.Enumerable.ToDictionary[TSource,TKey,TElement](IEnumerable`1 source, Func`2 keySelector, Func`2 elementSelector)
                           at UniGetUI.Core.Language.LanguageEngine.LoadLanguageFile(String LangKey) in D:\a\UniGetUI\UniGetUI\src\UniGetUI.Core.LanguageEngine\LanguageEngine.cs:line 122

We'll look into it