Minimalistic semantic translation system based on glossaries of lexemes and their expressions.

## Concept

A **lexeme** is a minimal semantic unit (e.g., `"game.won"`), and an **expression**
is its localized realization in a specific language (e.g., `"You won!"`).

A **glossary** is a collection of lexeme–expression mappings for a given language,
typically stored in a YAML file.

This module injects the functions `t/2` and `t/3` into the caller module for resolving
the expression of a lexeme in a given language using the loaded glossaries.

## Glossaries

Each YAML file represents a **glossary** — a set of localized expressions.

Glossaries are merged into a single lookup table keyed by `"language.lexeme"`.

Example structure of glossary:

    game.en.yml:
      game:
        won: "You won!"
        lost: "Game over."
        score: "Your score: {{score}}"

    game.ru.yml:
      game:
        won: "Вы победили!"
        lost: "Игра окончена."
        score: "Ваш счёт: {{score}}"

    user.en.yml:
      greeting: "Hello, {{name}}!"

    user.ru.yml:
      greeting: "Привет, {{name}}!"

## Principles

  * Lexemes are **semantic** — they represent **meaning**, not UI position.
    Good: `"game.score"`; Bad: `"label.bottom_right"`
  * Group lexemes in YAML files by shared domain (e.g., `game`, `user`)
  * Prefer flat structures with 2-level keys (domain + key)
  * File name is not part of the lexeme — lookup is clean and abstracted
  * Use `{{key}}` placeholders in expressions for interpolation

## Usage

    use Glossary, ["game", "user"]

Loads:

  - `game.en.yml`, `game.ru.yml`
  - `user.en.yml`, `user.ru.yml`

## Expression Lookup

    t("game.won", "en")
    # => "You won!"

    t("game.score", "en", score: 42)
    # => "Your score: 42"

    t("user.greeting", "ru", name: "Алиса")
    # => "Привет, Алиса!"