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A simple i18n library for rust

Configs

1. The default language files is undersrc/languages,and you could change it by the env var INTL_RS_DIR
2. The default locale(default_locale property) is zh_CN, and you could change it by the env var INTL_RS_LANG

Config File

Just support the json file for example en_US.json like below

json { "hello": { "world": "Hello,World!" } }

Usages

```rust env::setvar("INTLRS_DIR", "languages"); let key = "hello.world";

    assert_eq!(t!(key), "你好，世界！");

    assert_eq!(
        t!("unknown key", default:"default message"),
        "default message"
    );

    //default to ensure fallback
    //and you can disable it by disable_fallback function
    let configs = I18nConfig {
        fallback: None,
        locale: Some("en".to_owned()),
        null_placeholder: None,
    };
    assert_eq!(t!(key, configs: configs), "Hello,World!");

    let configs = I18nConfig {
        fallback: Some(true),
        locale: Some("en_UK".to_owned()),
        null_placeholder: None,
    };
    assert_eq!(t!(key, configs: configs), "Hello,World!");

    //change the default null placeholder
    let configs = I18nConfig {
        fallback: Some(true),
        locale: Some("en_UK".to_owned()),
        null_placeholder: Some("".to_owned()),
    };
    assert_eq!(t!("unknown key", configs: configs), "");

```