Add support for Lithuanian (lt)

### Prerequisites

- [x] I have checked the [Wiki](https://github.com/AdguardTeam/AdGuardHome/wiki) and [Discussions](https://github.com/AdguardTeam/AdGuardHome/discussions) and found no answer

- [x] I have searched other issues and found no duplicates

- [x] I want to request a feature or enhancement and not ask a question

### The problem

AdGuard does not support the Lithuanian language. Recently, it was **fully** translated on Crowdin.

### Proposed solution

Add the Lithuanian language to the web.

### Alternatives considered and additional information

_No response_